WASHINGTON (Reuters) - A new, Republican-controlled U.S. Congress convenes on Tuesday eager to repeal major portions of President Barack Obama's healthcare law and roll back environmental and financial industry regulations, but could quickly become embroiled in fights over President-elect Donald Trump's Cabinet choices.
Despite his promise to unite a deeply divided country, Trump will be sworn in on Jan. 20 leading a Republican Party that early on will push legislation through Congress without significant - or any - Democratic support.
According to a Gallup poll released on Monday, Trump will take office with less than half of Americans confident in his ability to handle an international crisis, use military force wisely or prevent major ethics lapses in his administration.
RELATED: What Trump and Putin have said about each other
What Putin and Trump have said about each other
What Putin and Trump have said about each other
At the end of 2015, Vladimir Putin lauded Trump's presidential campaign, calling him "an absolute leader of the presidential race, as we see it."
In response to Putin's compliments Trump said: "It is always a great honor to be so nicely complimented by a man so highly respected within his own country and beyond."
Putin has called Trump a "very outstanding man" and "unquestionably talented."
When Russia continued its military buildup in Syria and Putin backed the country's President Bashar al-Assad in 2015, Trump declared the Russian leader earned an "A" in leadership.
Trump not only gave the Russian leader an "A," he also said Putin has been a better leader than US President Barack Obama. "He is really very much of a leader," Trump said of Putin. "The man has very strong control over his country. Now, it's a very different system, and I don't happen to like the system, but certainly in that system he's been a leader, far more than our president has been a leader."
At a national security forum in September, Trump explained his friendly relationship with Putin saying: "If he says great things about me, I'm going to say great things about him."
When asked about allegations that Putin orchestrated the deaths of his political opponents and journalists, Trump defended Putin: "I haven't seen any evidence that he killed anybody."
After Trump won the election November 8, Putin sent the president-elect a telegram congratulating him on his victory.
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Leading Democrats on Monday warned of a fierce fight over Obamacare, which is expected to have 13.8 million people enrolled in the program that aims to provide health insurance to economically disadvantaged people and to expand coverage for others.
"We're going to fight as hard as ever to protect the ACA (Affordable Care Act), said Representative Steny Hoyer, the House of Representatives' second-ranking Democrat.
Speaking to reporters, Hoyer and House Democratic leader Nancy Pelosi said they would launch an effort to mobilize grassroots support for Obamacare by explaining how repeal would create a ripple effect hurting a majority of Americans.
For years, Republicans have hammered away at Obamacare, insisting it was unworkable and was hampering job growth. With control of Congress and the White House, they will be in a position to enact a repeal bill.
The U.S. Senate will have more than legislation on its hands in the new year.
It has the daunting task of debating and voting on the scores of appointees Trump already has announced to head his Cabinet departments and for other top jobs in the new administration.
It also is expected to receive a Supreme Court nomination early on from Trump, triggering a likely confirmation war.
RELATED: See Paul Ryan throughout his career
Paul Ryan through his career
Paul Ryan through his career
Speaker of the House Denis Hastert (L) administers the oath of office to Rep. Paul Ryan (R) of Wisconsin as his family looks on January 6, 1999 at the start of the 106th Congress. The oath is a recreation as the formal oath is administered to the entire congress as a body on the floor of the House. (photo by Rex Banner)
UNITED STATES - DECEMBER 12: Rep. Paul Ryan, R-Wis., speaks at a news conference in which House Republican leaders called for Permanent Tax Relief. (Photo By Tom Williams/Roll Call/Getty Images)
KRT US NEWS STORY SLUGGED: SOCIALSECURITY-DISCUSSION KRT PHOTOGRAPH BY GEORGE BRIDGES/KRT (April 14) Conversation on Social Security between Rep. Paul Ryan (R-WI), shown, and William Novelli, head of AARP, April 5, 2005 (lde) 2005 (Photo by George Bridges/MCT/MCT via Getty Images)
In this photo taken Dec. 1, 2015, House Speaker Paul Ryan of Wis. speaks on Capitol Hill in Washington.Talks on a massive, government-wide spending bill hit a snag Wednesday as Republicans pressed demands to block new power plant rules, weaken financial services regulations and make it more difficult for Syrian and Iraqi refugees to enter the U.S. (AP Photo/J. Scott Applewhite)
UNITED STATES - JULY 22: MEDICARE BRIEFING--Rep. Paul Ryan, R-Wisc., speaks at a Cato Institute briefing on Medicare reform in the Rayburn House Office Building. Tom Miller, director of Health Policy Studies at Cato, looks on. (Photo by Scott J. Ferrell/Congressional Quarterly/Getty Images)
WASHINGTON - SEPTEMBER 24: Rep. Paul Ryan (R-WI) questions Peter Orszag, director of the Congressional Budget Office, during a hearing on Capitol Hill about the impact of recent market turmoil on the federal budget on September 24, 2008 in Washington, DC. Orszag reported that while the impact is currently unknown, it is likely to be substantially less than $700 billion. (Photo by Brendan Hoffman/Getty Images)
WASHINGTON - APRIL 27: House Budget Committee ranking member Rep. Paul Ryan (R-WI) (R) delivers an opening statement during a conference committee meeting with Senate Budget Committee Chairman Kent Conrad (D-ND) (L) and House Budget Committee Chairman John Spratt (D-SC) in the U.S. Capitol April 27, 2009 in Washington, DC. House and Senate lawmakers have already struck a tentative deal on the FY2010 budget resolution and they hope to file a conference report after today's meeting. (Photo by Chip Somodevilla/Getty Images)
WASHINGTON - MARCH 19: (L-R) U.S. House Minority Whip Rep. Eric Cantor (R-VA), Rep. Dave Camp (R-MI) and Rep. Paul Ryan (R-WI) listen during a news conference on the health care legislation March 19, 2010 on Capitol Hill in Washington, DC. The House will vote on the Health Care Reform Legislation on Sunday, March 21. (Photo by Alex Wong/Getty Images)
Representative Paul Ryan, a Republican from Wisconsin and chairman of the House Budget Committee, speaks during a news conference at the U.S. Capitol in Washington, D.C., U.S., on Tuesday, April 5, 2011. U.S. House Republicans today unveiled a plan to overhaul the federal budget and slash the deficit in coming years by about three-quarters, with a $6-trillion cut in spending and 25 percent cap on tax rates. Photographer: Joshua Roberts/Bloomberg via Getty Images
MEET THE PRESS -- Pictured: Rep. Paul Ryan (R-WI) left, and moderator David Gregory, right, appear on 'Meet the Press' in Washington, D.C., Sunday, April 10, 2011. (Photo by William B. Plowman/NBC/NBCU Photo Bank via Getty Images)
MILWAUKEE, WI - APRIL 01: Republican Presidential candidate, former Massachusetts Gov. Mitt Romney (R) jokes with U.S. Rep Paul Ryan (C) (R-WI) during a pancake brunch at Bluemound Gardens on April 1, 2012 in Milwaukee, Wisconsin. With less than a week before the Wisconsin primary, Mitt Romney continues to campaign through the state. (Photo by Justin Sullivan/Getty Images)
WASHINGTON, DC - APRIL 26: House Budget Chairman Rep. Paul Ryan (R-WI) is introduced before speaking about 'America's Enduring Promise,' and the federal budget, in a speech at Georgetown University April 26, 2012 in Washington, DC. During his speech, Ryan said that his proposed budget confronts the nation's growing $15 trillion debt before it impacts future generations of Americans. (Photo by Win McNamee/Getty Images)
NORFOLK, VA - AUGUST 11: Republican presidential candidate, former Massachusetts Gov. Mitt Romney (L) jokes with Rep. Paul Ryan (R-WI) (R) after announcing him as the 'next PRESIDENT of the United States' during an event announcing him as his running mate in front of the USS Wisconsin August 11, 2012 in Norfolk, Virginia. Ryan, a seven term congressman, is Chairman of the House Budget Committee and provides a strong contrast to the Obama administration on fiscal policy. (Photo by Win McNamee/Getty Images)
UNITED STATES - SEPTEMBER 14: Rep. Paul Ryan, R-Wis., Vice Presidential candidate, waves to the crowd after addressing the Values Voter Summit at the Omni Shoreham Hotel in Woodley Park. Photo By Tom Williams/CQ Roll Call)
NEWPORT NEWS, VA - SEPTEMBER 18: Republican vice presidential candidate, U.S. Rep. Paul Ryan (R-WI), pauses as he speaks during a campaign rally at Christopher Newport University September 18, 2012 in Newport News, Virginia. Ryan continued to campaign for the upcoming presidential election. (Photo by Alex Wong/Getty Images)
MIAMI, FL - SEPTEMBER 22: Republican vice presidential candidate, U.S. Rep. Paul Ryan (R-WI) hugs waitress, Lourdes Alcerro, during a campaign stop at Versailles restaurant in the Little Havana neighborhood on September 22, 2012 in Miami, Florida. Ryan continues to campaign for votes across the country. (Photo by Joe Raedle/Getty Images)
Republican presidential candidate Mitt Romney (R) and running-mate Paul Ryan share a laugh as they are introduced at a campaign rally September 25, 2012 at Dayton International Airport in Vandalia, Ohio. AFP PHOTO/Mandel NGAN (Photo credit should read MANDEL NGAN/AFP/GettyImages)
Representative Paul Ryan, a Republican from Wisconsin, arrives at a news conference on Capitol Hill in Washington, D.C., U.S., on Tuesday, Oct. 20, 2015. Ryan said he'd be willing to run for speaker of the U.S. House if Republicans unify behind him now, end leadership crises and let him continue spending time with his family. Photographer: Andrew Harrer/Bloomberg via Getty Images
Representative Paul Ryan, a Republican from Wisconsin and chairman of the House Ways and Means Committee, center right, walks down the steps of the U.S. Capitol building following a vote in Washington, D.C., U.S., on Friday, Oct. 9, 2015. Ryan is under heavy pressure from fellow Republicans to run for U.S. House speaker after a hard-line faction forced Speaker John Boehner to resign and his top lieutenant to drop out of the race. Photographer: Andrew Harrer/Bloomberg via Getty Images
Rep. Paul Ryan, R- Wis., leaves his office before a House GOP meeting, Tuesday, Oct. 20, 2015, on Capitol Hill in Washington. (AP Photo/Andrew Harnik)
Representative Paul Ryan, a Republican from Wisconsin, walks to a meeting in the basement of the U.S. Capitol in Washington, D.C., U.S., on Tuesday, Oct. 20, 2015. Ryan is set to meet with a group of House conservatives Tuesday as he weighs a potential run to replace Speaker John Boehner under pressure from fellow Republicans. Photographer: Andrew Harrer/Bloomberg via Getty Images
Rep. Paul Ryan, R- Wis. leaves his office before a House GOP meeting, Tuesday, Oct. 20, 2015, on Capitol Hill in Washington. (AP Photo/Andrew Harnik)
Representative Paul Ryan, a Republican from Wisconsin and chairman of the House Ways and Means Committee, center, talks to the media after walking out of the U.S. Capitol building following a vote in Washington, D.C., U.S., on Friday, Oct. 9, 2015. Ryan is under heavy pressure from fellow Republicans to run for U.S. House speaker after a hard-line faction forced Speaker John Boehner to resign and his top lieutenant to drop out of the race. Photographer: Andrew Harrer/Bloomberg via Getty Images
Rep. Paul Ryan, R- Wis. leaves his office before a House Republican meeting, Tuesday, Oct. 20, 2015, on Capitol Hill in Washington. (AP Photo/Andrew Harnik)
UNITED STATES - OCTOBER 20 - Rep. Paul Ryan, R-Wis., speaks at a news conference following a House Republican meeting, on Capitol Hill in Washington, Tuesday, Oct. 20, 2015. Ryan is stating that he will run for speaker only if he receives enough GOP support by the end of the week. (Photo By Al Drago/CQ Roll Call)
Rep. Paul Ryan, R-Wis., center, speaks to reporters on Capitol Hill in Washington, Wednesday, Oct. 21, 2015, following meetings with House Republican leaders and the Freedom Caucus members. Ryan seeking unity in a place it's rarely found, is telling House Republicans he will serve as their speaker only if they embrace him by week's end as their consensus candidate. (AP Photo/Manuel Balce Ceneta)
US Speaker of the House Paul Ryan, Republican of Wisconsin, awaits the arrival of Israeli President Reuven Rivlin for a meeting at the US Capitol in Washington, DC, December 10, 2015. AFP PHOTO / SAUL LOEB / AFP / SAUL LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)
WASHINGTON, DC - DECEMBER 10: House Speaker Paul Ryan (R-WI) holds his weekly press briefing on Capitol Hill on December 10, 2015 in Washington, D.C. Paul Ryan spoke on topics including Donald Trump and the spending bill. (Photo by Allison Shelley/Getty Images)
WASHINGTON, DC - DECEMBER 15: Speaker of the House Paul Ryan, (R-WI) speaks during a Politico interview at the Grand Hyatt on December 15, 2015 in Washington DC. Ryan was interviewed by Politico's Chief White House Correspondent Mike Allen during a Politico Playbook Breakfast. (Photo by Mark Wilson/Getty Images)
House Speaker Paul Ryan of Wis. welcomes Israeli President Reuven Rivlin on Capitol Hill in Washington, Thursday, Dec. 10, 2015. (AP Photo/J. Scott Applewhite)
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Prominent Senator John McCain has warned that Rex Tillerson, Trump's choice for secretary of state, will have to explain his relations with Russian President Vladimir Putin, whom McCain has called a "thug and a murderer."
Tillerson, who spent much his career at Exxon Mobil Corp <XOM.N>, has been involved in business dealings in Russia and opposed U.S. sanctions against Russia for its incursion into Crimea.
Meanwhile, Democrats are expected to strongly oppose Republican Jeff Sessions to be attorney general, in part because of his opposition to immigration and past remarks that showed racial insensitivity.
And given Trump's campaign promise to "drain the swamp" in Washington of special interests, especially Wall Street influence, Democrats are also poised to attack the nomination of Steven Mnuchin to be treasury secretary.
Mnuchin is a successful private equity investor and hedge fund manager who spent 17 years at Goldman Sachs Group Inc.
While the Senate will be tied down for weeks debating these and other controversial nominees, Trump is expected to win approval of most, if not all.
Besides Obamacare repeal, Republicans also want to curtail or kill regulations aimed at further controlling industrial emissions that contribute to climate change and banking industry reforms enacted in the wake of the near-collapse of Wall Street several years ago.
Senate Majority Leader Mitch McConnell, who waged bitter battles against Obama over the past eight years, has warned his fellow Republicans against overreaching following their Nov. 8 election victories.
In an interview with Kentucky Educational Television on Dec. 19, McConnell said, "It's certainly no time for hubris" and there is "not much I can do (legislatively) with Republicans only in the U.S. Senate."
While he repeatedly called for removing Obamacare "root and branch," McConnell said in the interview that his top priorities for the new Congress were dealing with "massive overregulation" that he said has been a brake on the U.S. economy and accomplishing tax code changes to stop companies from moving jobs offshore.