Republicans scramble for Obamacare repeal votes after Trump ultimatum

WASHINGTON, March 24 (Reuters) - U.S. Republican lawmakers struggling to overcome differences over new healthcare legislation confronted a stark choice after President Donald Trump delivered an ultimatum: pass the bill on Friday or keep Obamacare in place.

Trump, a real estate magnate who touted his dealmaking prowess in the 2016 presidential campaign, faced the first major test of how well his skills would translate in Congress. Days of negotiations failed to produce a deal amid opposition from moderates and conservatives in his own Republican Party, and it was far from clear the bill had enough support to pass.

Financial markets, which have been buoyed by Trump's plans to cut taxes and boost infrastructure spending, are watching closely. U.S. stock markets fell on Thursday as Republican leaders delayed a vote, and European stock markets opened lower on Friday, although the U.S. equity market looked set for a higher open.

The House of Representatives was set to vote late Friday afternoon on the Trump-backed bill to replace Democratic President Barack Obama's 2010 Affordable Care Act.

RELATED: Getting to know the American Health Care Act

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WASHINGTON, DC - MAY 04: Republican House members join U.S. President Donald Trump on stage as he speaks during a Rose Garden event May 4, 2017 at the White House in Washington, DC. The House has passed the American Health Care Act that will replace the Obama era� Affordable Healthcare Act with a vote of 217-213. (Photo by Alex Wong/Getty Images)
WASHINGTON, DC - MAY 04: U.S. Sen. Bernie Sanders (I-VT) speaks during a Stop 'Trumpcare' rally May 4, 2017 in front of the Capitol in Washington, DC. Congressional Democrats joined activists for a rally to urge not to replace Obamacare, also known as the Affordable Care Act. (Photo by Alex Wong/Getty Images)
WASHINGTON, DC - MAY 04: U.S. Senate Minority Leader Sen. Charles Schumer (D-NY) (R) greets House Minority Leader Rep. Nancy Pelosi (D-CA) (L) during a Stop 'Trumpcare' rally May 4, 2017 in front of the Capitol in Washington, DC. Congressional Democrats joined activists for a rally to urge not to replace Obamacare, also known as the Affordable Care Act. (Photo by Alex Wong/Getty Images)
WASHINGTON, DC - MAY 04: U.S. President Donald Trump shares a moment with Speaker of the House Rep. Paul Ryan (R-WI) during a Rose Garden event May 4, 2017 at the White House in Washington, DC. The House has passed the American Health Care Act that will replace the Obama era� Affordable Healthcare Act with a vote of 217-213. (Photo by Alex Wong/Getty Images)
WASHINGTON, DC - MAY 04: U.S. House Minority Leader Rep. Nancy Pelosi (D-CA) (L) gestures as Sen. Patty Murray (D-WA) and Sen. Bernie Sanders (I-VT) wait for their turns to speak during a Stop 'Trumpcare' rally May 4, 2017 in front of the Capitol in Washington, DC. Congressional Democrats joined activists for a rally to urge not to replace Obamacare, also known as the Affordable Care Act. (Photo by Alex Wong/Getty Images)
UNITED STATES - MAY 4: Charlie Wood, 4, of Charlottesville, Va., plays with bubbles during rally on the East Front lawn of the Capitol to oppose the House Republicans' bill to repeal and replace the Affordable Care Act on May 4, 2017. She was born 3 1/2 months earlier and her mother Rebecca, at left, holding a picture of Charlie in the hospital, fears changes to the ACA will negatively effect her care. (Photo By Tom Williams/CQ Roll Call)
Health and Human Services Secretary Tom Price speaks in the Rose Garden of the White House following the House of Representative vote on the health care bill on May 4, 2017 in Washington, DC. Following weeks of in-party feuding and mounting pressure from the White House, lawmakers voted 217 to 213 to pass a bill dismantling much of Barack Obama's Affordable Care Act and allowing US states to opt out of many of the law's key health benefit guarantees / AFP PHOTO / Mandel NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)
Ivanka Trump and Jared Kushner listen to US President Donald Trump speak in the Rose Garden of the White House following the House of Representative vote on the health care bill on May 4, 2017 in Washington, D Following weeks of in-party feuding and mounting pressure from the White House, lawmakers voted 217 to 213 to pass a bill dismantling much of Barack Obama's Affordable Care Act and allowing US states to opt out of many of the law's key health benefit guarantees / AFP PHOTO / Mandel NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)
UNITED STATES - MARCH 9: Speaker of the House Paul Ryan, R-Wis., conducts a presentation in the House studio of the American Health Care Act, the GOP's plan to repeal and replace the Affordable Care Act, March 9, 2017. (Photo By Tom Williams/CQ Roll Call)
WASHINGTON, DC - MARCH 07: U.S. Secretary of Health and Human Services Tom Price compares a copy of the Affordable Care Act (R) and a copy of the new House Republican health care bill (L) during the White House daily press briefing March 7, 2017 at the White House in Washington, DC. Secretary Price answered questions on the new healthcare bill during the briefing. (Photo by Alex Wong/Getty Images)
U.S. Speaker of the House Paul Ryan speaks to the media about the American Health Care Act at the Capitol in Washington, D.C., U.S. March 15, 2017. REUTERS/Aaron P. Bernstein
WASHINGTON, DC - MARCH 13: U.S. Health and Human Services Secretary Tom Price (L) and Office of Management and Budget Director Mick Mulvaney talk to reporters following the release of the Congressional Budget Office report on the proposed American Health Care Act outside the White House West Wing March 13, 2017 in Washington, DC. Price said 'We disagree strenuously' with the findings of the CBO report about the Republican's attempt to repeal and replace the Affordable Care Act, or Obamacare. (Photo by Chip Somodevilla/Getty Images)
Speaker of the House Paul Ryan speaks at a news conference about Congressional efforts to repeal and replace Obamacare, on Capitol Hill in Washington, U.S. March 9, 2017. REUTERS/Aaron P. Bernstein
WASHINGTON, DC - MARCH 10: U.S. Vice President Mike Pence (4th L) delivers remarks at the beginning of a meeting with representatives of conservative political organizations to discuss the American Health Care Act in the Indian Treaty Room in the Eisenhower Executive Office Building March 10, 2017 in Washington, DC. Pence and Health and Human Services Secretary Tom Price led the meeting that included representatives from the Cato Institute, Tea Party Patriots, the American Conservative Union, Freedom Works, the American Legislative Exchange Council and other conservative groups. (Photo by Chip Somodevilla/Getty Images)
U.S. Speaker of the House Paul Ryan speaks to the media about the American Health Care Act at the Capitol in Washington, D.C., U.S. March 15, 2017. REUTERS/Aaron P. Bernstein
WASHINGTON, DC - MARCH 10: (L-R) U.S. Vice President Mike Pence and President Donald Trump greet House of Representatives committee leaders (L-R) House Budget Committee Chairwoman Diane Black (R-TN), Energy and Commerce Committee Chairman Greg Walden (R-WA) and Education and Workforce Committee Chairwoman Virginia Foxx (R-NC) before a meeting to discuss the American Health Care Act in the Roosevelt Room at the White House March 10, 2017 in Washington, DC. The proposed legislation is the Republican attempt to repeal and replace Obamacare. (Photo by Chip Somodevilla/Getty Images)
U.S. Speaker of the House Paul Ryan speaks to the media about the American Health Care Act at the Capitol in Washington, D.C., U.S. March 15, 2017. REUTERS/Aaron P. Bernstein
U.S. Health and Human Services Secretary Tom Price speaks about efforts to repeal and replace Obamacare and the advancement of the American Health Care Act on Capitol Hill in Washington, U.S., March 17, 2017. REUTERS/Joshua Roberts
A copy of Obamacare repeal and replace recommendations (L) produced by Republicans in the U.S. House of Representatives sit next to a copy of the Affordable Care Act known as Obamacare as U.S. Health and Human Services Secretary Tom Price addresses the daily press briefing at the White House in Washington, U.S. March 7, 2017. REUTERS/Carlos Barria
(L-R) U.S. House Speaker Paul Ryan, U.S. House Majority Leader Kevin McCarthy, and U.S. Representative Greg Walden hold a news conference on the American Health Care Act on Capitol Hill in Washington, U.S. March 7, 2017. REUTERS/Eric Thayer
UNITED STATES - MARCH 14: House Minority Leader Nancy Pelosi, D-Calif., and Senate Minority Leader Charles Schumer, D-N.Y., attend a news conference in the Capitol Visitor Center to voice opposition to House Republican's health care plan, the American Health Care Act, March 14, 2017. The event featured testimony from patients and doctors who benefit from the Affordable Care Act. (Photo By Tom Williams/CQ Roll Call)
UNITED STATES - MARCH 14: From left, Dr. Alice T. Chen, Senate Minority Leader Charles Schumer, D-N.Y., Sen. Maggie Hassn, D-N.H., and House Minority Leader Nancy Pelosi, D-Calif., attend a news conference in the Capitol Visitor Center to voice opposition to House Republican's health care plan, the American Health Care Act, March 14, 2017. The event featured testimony from patients and doctors who benefit from the Affordable Care Act. (Photo By Tom Williams/CQ Roll Call)
Speaker of the House Paul Ryan speaks at a news conference about Congressional efforts to repeal and replace Obamacare, on Capitol Hill in Washington, U.S. March 9, 2017. REUTERS/Aaron P. Bernstein
WASHINGTON, DC - MARCH 08: House Energy and Commerce Committee staff members work during a markup hearing on the proposed American Health Care Act, the Republican attempt to repeal and replace Obamacare, in the Rayburn House Office Building on Capitol Hill March 8, 2017 in Washington, DC. House Republicans were rushing the legislation through the powerful Energy and Commerce, and Ways and Means committees, aiming for a full House vote next week. (Photo by Chip Somodevilla/Getty Images)
WASHINGTON, DC - MARCH 07: House Energy and Commerce Chairman Greg Walden (R-OR) (R) and House Ways and Means Chairman Kevin Brady (R-TX) (L) arrive for a news conference on the newly announced American Health Care Act at the U.S. Capitol March 7, 2017 in Washington, DC. House Republicans yesterday released details on their plan to replace the Affordable Care Act, or Obamacare, with a more conservative agenda that includes individual tax credits and grants for states replacing federal insurance subsidies. (Photo by Win McNamee/Getty Images)
White House Press Secretary Sean Spicer (L) looks on as US Secretary of Health and Human Service Tom Price (R) points to a print-out of the Affordable Care Act (ACA) and a copy of the new plan introduced to repeal and replace the ACA during the daily briefing at the White House in Washington, DC on March 7, 2017. / AFP PHOTO / JIM WATSON (Photo credit should read JIM WATSON/AFP/Getty Images)
WASHINGTON, DC - MARCH 07: House Ways and Means Chairman Kevin Brady (R-TX) (L) and House Energy and Commerce Chairman Greg Walden (R-OR) (R) answer questions during a news conference on the newly announced American Health Care Act at the U.S. Capitol March 7, 2017 in Washington, DC. House Republicans yesterday released details on their plan to replace the Affordable Care Act, or Obamacare, with a more conservative agenda that includes individual tax credits and grants for states replacing federal insurance subsidies. (Photo by Win McNamee/Getty Images)
UNITED STATES - MAY 4: Protesters yell 'shame'' to members of Congress on the East Front of the Capitol after the House passed the Republicans' bill to repeal and replace the Affordable Care Act on May 4, 2017. The protesters support the ACA. (Photo By Tom Williams/CQ Roll Call)
WASHINGTON, DC - MAY 04: U.S. Sen. Bernie Sanders (I-VT) speaks during a Stop 'Trumpcare' rally May 4, 2017 in front of the Capitol in Washington, DC. Congressional Democrats joined activists for a rally to urge not to replace Obamacare, also known as the Affordable Care Act. (Photo by Alex Wong/Getty Images)
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"Lawmakers will have to be accountable as to why they didn't vote to get rid of Obamacare when they had the chance, and that chance is today," White House budget director Mick Mulvaney told CBS "This Morning."

The House Rules Committee, which sets the duration of the debate on legislation and decides whether amendments will be allowed to be offered, was expected to formally send the Republican healthcare bill to the House floor on Friday morning.

Democrats uniformly oppose the bill, and it appeared to lack the needed Republican support as well, despite last-minute changes intended to broaden its appeal.

At least 35 Republicans still plan to vote against the bill, according to CBS News. If all House members were to vote, Republicans can only afford to lose 21 votes.

The American Health Care Act is the first foray into legislation for Trump, a New York businessman and reality television star who took office on Jan. 20.

SEE ALSO: Republicans delay vote on 'Trumpcare' after struggling to reach agreement on the bill

The vote had been set for Thursday, the seventh anniversary of the signing of Obamacare. In an embarrassing setback, it was postponed because of tepid support.

By Thursday evening, Trump signaled he was done negotiating and demanded lawmakers back the bill, or face the consequences.

"The message is ... it's done tomorrow, or Obamacare stays," said Representative Chris Collins of New York, a Trump ally.

KEY CAMPAIGN PLEDGE

Replacing Obama's signature health care plan was a key campaign pledge for Trump and Republicans, who viewed it as overly intrusive and expensive.

Obamacare aimed to boost the number of Americans with health insurance through mandates on individuals and employers, and income-based subsidies. About 20 million Americans gained insurance coverage through the law.

The House replacement plan would rescind taxes created by Obamacare, repeal a penalty against people who do not buy coverage, slash funding for the Medicaid program for the poor and disabled, and modify tax subsidies that help individuals buy plans.

RELATED: Donald Trump's first 100 days in office, a photo for each day

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Donald Trump's first 100 days in office, a photo for each day
US President Donald Trump takes the oath of office with his wife Melania and son Barron at his side, during his inauguration at the U.S. Capitol in Washington, U.S., January 20, 2017. REUTERS/Kevin Lamarque TPX IMAGES OF THE DAY
U.S. President Donald Trump waves as he leaves the Central Intelligence Agency (CIA) headquarters after delivering remarks during a visit in Langley, Virginia U.S., January 21, 2017. REUTERS/Carlos Barria TPX IMAGES OF THE DAY
U.S. President Donald Trump shows a letter from former President Barack Obama at a swearing-in ceremony for senior staff at the White House in Washington, DC January 22, 2017. REUTERS/Carlos Barria
U.S. President Donald Trump holds up the executive order on withdrawal from the Trans Pacific Partnership after signing it in the Oval Office of the White House in Washington January 23, 2017. REUTERS/Kevin Lamarque
U.S. President Donald Trump speaks to reporters while signing an executive order to advance construction of the Keystone XL pipeline at the White House in Washington January 24, 2017. REUTERS/Kevin Lamarque
U.S. President Donald Trump, left, speaks as U.S. Vice President-elect Mike Pence, center, and John Kelly, secretary of U.S. Homeland Security, stand during a visit to the Department of Homeland Security (DHS) in Washington, D.C. U.S., on Wednesday, Jan. 25, 2017. Trump acted on two of the most fundamental -- and controversial -- elements of his presidential campaign, building a wall on the border with Mexico and greatly tightening restrictions on who can enter the U.S. Photographer: Chip Somodevilla/Pool via Bloomberg
U.S. President Donald Trump speaks briefly to reporters as he arrives aboard Air Force One at Joint Base Andrews, Maryland, U.S. January 26, 2017. REUTERS/Jonathan Ernst
WASHINGTON, DC - JANUARY 27: British Prime Minister Theresa May shakes hands with U.S. President Donald Trump in The Oval Office at The White House on January 27, 2017 in Washington, DC. British Prime Minister Theresa May is on a two-day visit to the United States and will be the first world leader to meet with President Donald Trump. (Photo by Christopher Furlong/Getty Images)
U.S. President Donald Trump, flanked by Chief of Staff Reince Priebus (R), speaks by phone with Russia's President Vladimir Putin in the Oval Office at the White House in Washington, U.S. January 28, 2017. REUTERS/Jonathan Ernst
Activists march to the US Capitol to protest President Donald Trump's executive actions on immigration in Washington January 29, 2017. REUTERS/Aaron P. Bernstein TPX IMAGES OF THE DAY
U.S. President Donald Trump speaks before signing an executive order while surrounded by small business leaders in the Oval Office of the White House in Washington, D.C., U.S., on Monday, Jan. 30, 2017. Trump said he will dramatically reduce regulations overall with this executive action as it requires that for every new federal regulation implemented, two must be rescinded. Photographer: Andrew Harrer/Bloomberg via Getty Images
WASHINGTON, DC - JANUARY 31: (AFP OUT) U.S. President Donald Trump shakes hands with Robert J. Hugin, Executive Chairman, Celgene Corporation, as he meets with representatives from PhRMA, the Pharmaceutical Research and Manufacturers of America in the Roosevelt Room of the White House on January 31, 2017 in Washington, DC. According to its website, PhRMA 'represents the country's leading biopharmaceutical researchers and biotechnology companies.' Kenneth C. Frazier, Chairman and CEO of Merck & Co. looks on from left. (Photo by Ron Sachs - Pool/Getty Images)
Rex Tillerson, U.S. Secretary of State for President Donald Trump, left, speaks as U.S. President Donald Trump listen after the swearing-in ceremony in the Oval Office of the White House in Washington, D.C., U.S., on Wednesday, Feb. 1, 2017. Tillerson won Senate confirmation as secretary of state after lawmakers split mostly along party lines on President Trump's choice of an oilman with no government experience but a career negotiating billions of dollars of energy deals worldwide. Photographer: Michael Reynolds/Pool via Bloomberg
WASHINGTON, DC - FEBRUARY 2: President Trump and Vice President Mike Pence meet with Harley Davidson executives and Union Representatives on the South Lawn of the White House in Washington, DC on Thursday, Feb. 02, 2017. (Photo by Jabin Botsford/The Washington Post via Getty Images)
U.S. President Donald Trump waves as he arrives at West Palm Beach International airport in West Palm Beach, Florida, U.S., February 3, 2017. REUTERS/Carlos Barria
U.S. President Donald Trump and First Lady Melania Trump attend the 60th Annual Red Cross Gala at Mar-a-Lago club in Palm Beach, Florida, U.S., February 4, 2017. REUTERS/Carlos Barria
US President Donald Trump watches the Super Bowl with First Lady Melania Trump (R) and White House Chief of Staff Reince Priebus (L) at Trump International Golf Club Palm Beach in West Palm Beach, Florida on February 5, 2017. / AFP / MANDEL NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)
U.S. President Donald Trump salutes as he arrives at MacDill Air Force Base in Tampa, Florida, U.S., February 6, 2017. REUTERS/Carlos Barria
U.S. President Donald Trump receives a figurine of a sheriff during a meeting with county sheriffs at the White House in Washington, U.S. February 7, 2017. REUTERS/Kevin Lamarque TPX IMAGES OF THE DAY
U.S. President Donald Trump speaks while Brian Krzanich, chief executive officer of Intel Corp., left, listens during a meeting at The White House in Washington, D.C., U.S., on Wednesday, Feb. 8, 2017. Trump defended his power to put limits on who can enter the U.S., saying it shouldn't be challenged in the courts even as a three-judge panel weighs whether to reinstate restrictions on refugees and travelers from seven predominantly Muslim nations. Photographer: Chris Kleponis/Pool via Bloomberg
U.S. President Donald Trump watches as Vice President Mike Pence (R) swears in Jeff Sessions (L) as U.S. Attorney General while his wife Mary Sessions holds the Bible in the Oval Office of the White House in Washington, U.S., February 9, 2017. REUTERS/Kevin Lamarque
Japanese Prime Minister Shinzo Abe is greeted by U.S. President Donald Trump (L) ahead of their joint news conference at the White House in Washington, U.S., February 10, 2017. REUTERS/Joshua Roberts
US President Donald Trump and First Lady Melania Trump pose for photos with Japanese Prime Minister Shinzo Abe and his wife Akke Abe at Trump's Mar-a-Lagoresort in Palm Beach, Florida, on February 11, 2017 prior to dinner. / AFP / NICHOLAS KAMM (Photo credit should read NICHOLAS KAMM/AFP/Getty Images)
U.S. President Donald Trump arrives on Air Force One at Joint Base Andrews, Maryland, U.S., February 12, 2017. REUTERS/Carlos Barria
Canadian Prime Minister Justin Trudeau (L) and U.S. President Donald Trump shake hands during a joint news conference at the White House in Washington, U.S., February 13, 2017. REUTERS/Kevin Lamarque
U.S. President Donald Trump listens to U.S. Secretary of Education Betsy DeVos speak at meeting with teachers and parents at the White House in Washington, U.S., February 14, 2017. REUTERS/Kevin Lamarque
U.S. President Donald Trump (2ndR) and first lady Melania Trump greet Israeli Prime Minister Benjamin Netanyahu and his wife Sara (L) as they arrive at the South Portico of the White House in Washington, U.S., February 15, 2017.REUTERS/Kevin Lamarque
U.S. President Donald Trump announces Alexander Acosta as his new nominee to lead the Department of Labor during a news conference at the White House in Washington, U.S., February 16, 2017. REUTERS/Kevin Lamarque
U.S. President Donald Trump walks with his grandchildren Arabella and Joseph to Marine One upon his departure from the White House in Washington, U.S., February 17, 2017. REUTERS/Carlos Barria
U.S. President Donald Trump and first lady Melania Trump acknowledge supporters during a "Make America Great Again" rally at Orlando Melbourne International Airport in Melbourne, Florida, U.S. February 18, 2017. REUTERS/Kevin Lamarque
The motorcade of U.S. President Donald Trump turns into Trump International Golf Club in West Palm Beach, Florida U.S., February 19, 2017. REUTERS/Kevin Lamarque
U.S. President Donald Trump announces his new National Security Adviser Army Lt. Gen. H.R. McMaster (L) and that acting adviser Keith Kellogg (R) will become the chief of staff of the National Security Council at Trump's Mar-a-Lago estate in Palm Beach, Florida U.S. February 20, 2017. REUTERS/Kevin Lamarque TPX IMAGES OF THE DAY
WASHINGTON, DC - FEBRUARY 21: (AFP OUT) President Donald Trump tours the Smithsonian National Museum of African American History & Culture on February 21, 2017 in Washington, DC. (Photo by Kevin Dietsch - Pool/Getty Images)
Director of the Office of Management and Budget Mick Mulvaney (L) listens to U.S. President Donald Trump speak during a "strategic initiatives" lunch at the White House in Washington, U.S., February 22, 2017. REUTERS/Kevin Lamarque
U.S. President Donald Trump arrives for a meeting with experts on addressing human trafficking at the White House in Washington, DC, U.S. February 23, 2017. REUTERS/Jonathan Ernst
U.S. President Donald Trump addresses the Conservative Political Action Conference (CPAC) in Oxon Hill, Maryland, U.S. February 24, 2017. REUTERS/Jonathan Ernst
U.S. President Donald Trump leaves after a dinner at Trump International Hotel in Washington, U.S., February 25, 2017. REUTERS/Yuri Gripas
WASHINGTON, DC - FEBRUARY 26: AFP OUT President Donald Trump delivers brief remarks before a toast during the annual Governors' Dinner in the East Room of the White House February 26, 2017 in Washington, DC. Part of the National Governors Association� annual meeting in the nation's capital, the black tie dinner and ball is the first formal event the Trumps will host at the White House since moving in last month. (Photo by Chip Somodevilla/Getty Images)
WASHINGTON, DC - FEBRUARY 27: U.S. President Donald Trump poses with the Historically Black Colleges and Universities in the Oval Office of the White House, on February 27, 2017 in Washington, DC. (Photo by Aude Guerrucci-Pool/Getty Images)
US Vice President Mike Pence (L) and Speaker of the House Paul Ryan (R) applaud as US President Donald J. Trump (C) arrives to deliver his first address to a joint session of Congress from the floor of the House of Representatives in Washington, DC, USA, 28 February 2017. REUTERS/Jim Lo Scalzo
U.S. President Donald Trump looks up while hosting a House and Senate leadership lunch at the White House in Washington, U.S. March 1, 2017. REUTERS/Kevin Lamarque
U.S. President Donald Trump tours the pre-commissioned U.S. Navy aircraft carrier Gerald R. Ford at Huntington Ingalls Newport News Shipbuilding facilities in Newport News, Virginia, U.S. March 2, 2017. REUTERS/Jonathan Ernst 
U.S. President Donald Trump, joined by U.S. Senator Marco Rubio (from L), U.S. Education Secretary Betsy DeVos and White House advisor Jared Kushner, thanks fourth-grade students for the "Happy Birthday Florida" card they gave him as he visits their classroom at Saint Andrew Catholic School in Orlando, Florida, U.S. March 3, 2017. REUTERS/Jonathan Ernst
WEST PALM BEACH, FL - MARCH 04: US President Donald Trump waves from his vehicle as he stops while being driven past supporters near his Mar-a-Lago resort home on March 4, 2017 in West Palm Beach, Florida. President Trump spent part of the weekend at the house. (Photo by Joe Raedle/Getty Images)
WASHINGTON, DC - MARCH 05: President Donald J. Trump walks across the South Lawn towards the White House on March 5, 2017 in Washington, DC. Trump is returning from a weekend at his Mar-a-Lago club in Palm Beach. Florida. (Photo by Erik S. Lesser-Pool/Getty Images)
U.S. Secretary of State Rex Tillerson (L) and U.S. Attorney General Jeff Sessions stand together after speaking on issues related to visas and travel after U.S. President Donald Trump signed a new travel ban order in Washington, U.S., March 6, 2017. REUTERS/Kevin Lamarque
Beside a painting of Hillary Clinton, U.S. President Donald Trump makes a surprise appearance in front of a tour group at the White House in Washington, U.S. March 7, 2017. REUTERS/Kevin Lamarque
WASHINGTON, DC - MARCH 8: First Lady Melania Trump arrives at a luncheon she was hosting to mark International Women's Day in the State Dining Room at the White House in Washington, DC on Wednesday, March. 08, 2017. (Photo by Jabin Botsford/The Washington Post via Getty Images)
WASHINGTON, DC - MARCH 09: US President Donald Trump greets Dorothy Savarese, CEO of Cape Cod Five Mutual Company, during a National Economic Council listening session with the CEOs of small and community banks, in the Roosevelt Room at the White House on March 9, 2017 in Washington, D.C. (Photo by Kevin Dietsch-Pool/Getty Images)
U.S. President Donald Trump talks with Representative Greg Walden (R-OR) during a healthcare meeting with key House Committee Chairmen at the White House in Washington, U.S., March 10, 2017. REUTERS/Carlos Barria
POTOMAC FALLS, VA - MARCH 11: President Donald Trump has a working lunch with staff and cabinet members and significant others at his golf course, Trump National on March 11, 2017 in Potomac Falls, Virginia. (Photo by Pete Marovich-Pool/Getty Images)
A boy looks at a man dressed in the likeness of U.S. President Donald Trump as ultra Orthodox Jewish men dressed in Purim costumes take part in the reading from the Book of Esther ceremony performed on the Jewish holiday of Purim, a celebration of the Jews' salvation from genocide in ancient Persia, as recounted in the Book of Esther, in Jerusalem March 12, 2017. REUTERS/Ammar Awad
U.S. President Donald Trump is applauded by his cabinet as he signs an executive order entitled "Comprehensive Plan for Reorganizing the Executive Branch" in the Oval Office at the White House in Washington, U.S. March 13, 2017. REUTERS/Jonathan Ernst
U.S. President Donald Trump and Saudi Deputy Crown Prince and Minister of Defense Mohammed bin Salman enter the State Dining Room of the White House in Washington, U.S., March 14, 2017. REUTERS/Kevin Lamarque
U.S. President Donald Trump takes the stage for a rally at Municipal Auditorium in Nashville, Tennessee, U.S. March 15, 2017. REUTERS/Jonathan Ernst
Ireland's Prime Minister Enda Kenny (R) presents a traditional gift of a bowl of shamrocks to U.S. President Donald Trump during a St. Patrick's Day reception at the White House in Washington, U.S. March 16, 2017. REUTERS/Jonathan Ernst
German Chancellor Angela Merkel (L) and U.S. President Donald Trump walk to a joint news conference in the East Room of the White House in Washington, U.S., March 17, 2017. REUTERS/Joshua Roberts
The motorcade of U.S. President Donald Trump makes its way to Trump International Golf Club in West Palm Beach, Florida, U.S., March 18, 2017. REUTERS/Kevin Lamarque
U.S. President Donald Trump speaks to reporters with New England Patriots owner Robert Kraft at his side aboard Air Force One as he departs West Palm Beach, Florida, U.S., to return to Washington March 19, 2017. REUTERS/Kevin Lamarque
U.S. President Donald Trump walks on the South Lawn of the White House to board Marine One before departing to Louisville, Kentucky, in Washington U.S., March 20, 2017. REUTERS/Carlos Barria
U.S. President Donald Trump receives a NASA jacket during a signing ceremony for S442, the NASA transition authorization act, in the Oval Office of the White House in Washington, U.S., March 21, 2017. REUTERS/Kevin Lamarque
U.S. President Donald Trump attends a meeting with the Congressional Black Caucus Executive Committee at the White House in Washington, DC, U.S., March 22, 2017. REUTERS/Carlos Barria
U.S. President Donald Trump reacts as he sits on a truck while he welcomes truckers and CEOs to attend a meeting regarding healthcare at the White House in Washington, U.S., March 23, 2017. REUTERS/Carlos Barria TPX IMAGES OF THE DAY
WASHINGTON, DC - MARCH 24: U.S. President Donald Trump meets with Medal of Honor recipients in the Oval Office of the White House on March 24, 2017 in Washington, DC. The meeting with decorated war heroes took place on Medal of Honor Day (Photo by Olivier Douliery-Pool/Getty Images)
U.S. President Donald Trump leaves after a dinner at Trump International Hotel in Washington, U.S., March 25, 2017. REUTERS/Yuri Gripas
Security personnel stand watch as U.S. President Donald Trump's motorcade arrives at the Trump National Golf Club in Potomac Falls, Virginia, U.S., March 26, 2017. REUTERS/Joshua Roberts
Interior Secretary Ryan Zinke (C) receives a pen after U.S. President Donald Trump signed H.J. Res. 57, in the Roosevelt room of the White House in Washington, U.S., March 27, 2017. REUTERS/Carlos Barria
U.S. President Donald Trump holds up an executive order on "energy independence," eliminating Obama-era climate change regulations, during a signing ceremony at the Environmental Protection Agency (EPA) headquarters in Washington, U.S., March 28, 2017. REUTERS/Carlos Barria
US President Donald Trump jokes with New Jersey Governor Chris Christie during a meeting about opioid and drug abuse in the Roosevelt Room at the White House in Washington, DC, on March 29, 2017. / AFP PHOTO / NICHOLAS KAMM (Photo credit should read NICHOLAS KAMM/AFP/Getty Images)
US President Donald Trump shakes hands with Danish Prime Minister Lars Lokke Rasmussen at the White House in Washington, DC, March 30, 2017. / AFP PHOTO / JIM WATSON (Photo credit should read JIM WATSON/AFP/Getty Images)
U.S. President Donald Trump leaves after speaking at a schedule signing ceremony of executive orders on trade as Vice President Mike Pence (C) reacts at the Oval Office of the White House in Washington, U.S., March 31, 2017. REUTERS/Carlos Barria
TOPSHOT - People wearing masks of US President Donald Trump take part in the 32nd Annual April Fools Day Parade in New York on April 1, 2017. The theme for this years parade is MAKE RUSSIA GREAT AGAIN! The Grand Marshall will be a Donald Trump look-alike. The full parade was actually a April Fools' prank. / AFP PHOTO / TIMOTHY A. CLARY (Photo credit should read TIMOTHY A. CLARY/AFP/Getty Images)
The motorcade of US President Donald Trump arrives at Trump National Golf Club in Potomac Falls, Virginia, April 2, 2017. / AFP PHOTO / SAUL LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)
WASHINGTON, USA - APRIL 03 : (----EDITORIAL USE ONLY MANDATORY CREDIT - 'PRESIDENCY OF EGYPT / HANDOUT' - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) U.S. President Donald Trump meets Egyptian President Abdel Fattah el-Sisi (R) at the White House in Washington, United States on April 3, 2017. (Photo by Presidency of Egypt / Handout/Anadolu Agency/Getty Images)
U.S. President Donald Trump holds up a chart showing the complexity of regulations as he speaks at the 2017 North America?s Building Trades Unions National Legislative Conference in Washington, U.S., April 4, 2017. REUTERS/Joshua Roberts
U.S. President Donald Trump (L) and first lady Melania Trump (2ndL) welcome Jordan?s King Abdullah (R) and Queen Rania at the White House in Washington, U.S., April 5, 2017. REUTERS/Kevin Lamarque
U.S. President Donald Trump and First Lady Melania Trump welcome Chinese President Xi Jinping and first lady Peng Liyuan at Mar-a-Lago estate in Palm Beach, Florida, U.S., April 6, 2017. REUTERS/Carlos Barria 
U.S. President Donald Trump and China's President Xi Jinping chat as they walk along the front patio of the Mar-a-Lago estate after a bilateral meeting in Palm Beach, Florida, U.S., April 7, 2017. REUTERS/Carlos Barria
US President Donald Trump looks out the window as he departs the Mar-a-Lago estate in Palm Beach, Florida, April 8, 2017. / AFP PHOTO / JIM WATSON (Photo credit should read JIM WATSON/AFP/Getty Images)
Marine One carrying U.S. President Donald Trump prepares to land on South Lawn of the White House in Washington, U.S., April 9, 2017. REUTERS/Joshua Roberts
US President Donald Trump claps for Neil Gorsuch after he took the judicial oath during a ceremony in the Rose Garden of the White House April 10, 2017 in Washington, DC. / AFP PHOTO / Brendan Smialowski (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
U.S. President Donald Trump, center, speaks during a strategic and policy discussion with executives at the White House in Washington, D.C., U.S., on Tuesday, April 11, 2017. The Trump administration has been hobbled by botched policy roll-outs and an early failure on another signature promise -- health-care reform -- and it remains to be seen whether Trump's infrastructure pledges can translate to a permanent boost for business. Photographer: Olivier Douliery/Pool via Bloomberg
U.S. President Donald Trump (R) addresses a joint news conference with NATO Secretary General Jens Stoltenberg in the East Room at the White House in Washington, U.S., April 12, 2017. REUTERS/Jonathan Ernst 
WEST PALM BEACH, FL - APRIL 13: US President Donald Trump arrives on Air Force One at the Palm Beach International Airport to spend Easter weekend at Mar-a-Lago resort on April 13, 2017 in West Palm Beach, Florida. President Trump has made numerous trips to his Florida home and according to reports has cost over an estimated $20 million in his first 80 days in office. (Photo by Joe Raedle/Getty Images)
Supporters of U.S. President Donald Trump drive outside the Mar-a-Lago estate in Palm Beach, Florida, U.S., April 14, 2017. Picture taken April 14, 2017. REUTERS/Yuri Gripas
Protestors take part in the 'Tax March' to call on US President Donald Trump to release his tax records on April 15, 2017 in Washington, DC. / AFP PHOTO / Mandel Ngan (Photo credit should read MANDEL NGAN/AFP/Getty Images)
U.S. President Donald Trump and his son Barron board Air Force One at Palm Beach International Airport in West Palm Beach, Florida, U.S. after Easter weekend, April 16, 2017. REUTERS/Yuri Gripas
U.S. President Donald Trump and his son Donald Trump, Jr., watch children roll Easter Eggs at 139th annual White House Easter Egg Roll on the South Lawn of the White House in Washington, U.S., April 17, 2017. REUTERS/Joshua Roberts
U.S. President Donald Trump speaks before signing an executive order directing federal agencies to recommend changes to a temporary visa program used to bring foreign workers to the United States to fill high-skilled jobs during a visit to the world headquarters of Snap-On Inc, a tool manufacturer, in Kenosha, Wisconsin, U.S., April 18, 2017. REUTERS/Kevin Lamarque TPX IMAGES OF THE DAY
U.S. President Donald Trump holds up a New England Patriots jersey as Head Coach Bill Belichick (L) watches during an event honoring the Super Bowl champion New England Patriots at the White House in Washington, U.S., April 19, 2017. REUTERS/Joshua Roberts
US President Donald Trump shakes hands with Italian Prime Minister Paolo Gentiloni (R) during a press conference in the East Room at the White House in Washington, DC, April 20, 2017. / AFP PHOTO / SAUL LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)
U.S. President Donald Trump shakes hands with Aya Hijazi, an Egyptian-American woman detained in Egypt for nearly three years on human trafficking charges, after she was flown back to the United States on Thursday, in the Oval Office of the White House in Washington, U.S., April 21, 2017. REUTERS/Kevin Lamarque
U.S. President Donald Trump awards a Purple Heart to Army Sgt First Class Alvaro Barrientos at Walter Reed National Military Medical Center in Bethesda, Maryland, U.S., April 22, 2017. REUTERS/Yuri Gripas
Guests watch a video of U.S. President Donald Trump as he addresses the 15th Plenary Assembly of the World Jewish Congress in New York City, U.S., April 23, 2017. REUTERS/Brendan McDermid
With U.S. Ambassador to the United Nations Nikki Haley at his side, U.S. President Donald Trump hosts a working lunch with ambassadors of countries on the UN Security Council at the White House in Washington, U.S., April 24, 2017. REUTERS/Kevin Lamarque
U.S. President Donald Trump delivers the keynote address at the U.S. Holocaust Memorial Museum's "Days of Remembrance" ceremony in the Capitol Rotunda in Washington, U.S, April 25, 2017. REUTERS/Yuri Gripas
Sydney Chaffee receives the 2017 National Teacher of the Year award from U.S. President Donald Trump during an event at the Oval Office of the White House in Washington, U.S., April 26, 2017. REUTERS/Carlos Barria
U.S. President Donald Trump looks out a window of the Oval Office following an interview with Reuters at the White House in Washington, U.S., April 27, 2017. REUTERS/Carlos Barria
U.S. President Donald Trump arrives onstage to deliver remarks at the National Rifle Association (NRA) Leadership Forum at the Georgia World Congress Center in Atlanta, Georgia, U.S., April 28, 2017. REUTERS/Jonathan Ernst
People cheer as U.S. President Donald Trump appears on stage at a rally in Harrisburg, Pennsylvania, U.S. April 29, 2017. REUTERS/Carlo Allegri
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Conservatives believe the Republican bill does not go far enough to repeal Obamacare and moderates think the plan could hurt their constituents.

House leaders agreed to four pages of last-minute amendments, including allowing states to choose which "essential benefits" are required in insurance plans, keeping a 0.9 percent surcharge on Medicare for high-income Americans for six years, and giving states more money for maternal health and mental health.

It was unclear whether that was enough to win over skeptics.

Trump has indicated an eagerness to move on to tax reform, trade deals and infrastructure, but a defeat in Congress will cast doubt on his ability to deliver.

SEE ALSO: Poll: Majority prefer Obamacare to Trumpcare

If Republicans manage to ram the legislation through the House, it faces a tough fight in the Senate. It could draw opposition from moderate Senate Republicans who do not like the House measure's new restrictions on federal funding for women's healthcare provider Planned Parenthood.

Many senators, especially those who represent poor, rural states, worry that constituents who for the first time have health insurance because of Obamacare, will lose that coverage and not be able to afford the Republican replacement.

The House and Senate had hoped to deliver a new healthcare bill to Trump by April 8, when Congress is scheduled to begin a two-week spring break.

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