Pelosi to announce formal impeachment inquiry of Trump

House Speaker Nancy Pelosi, D-Calif., who for months resisted efforts to launch impeach proceedings against President Donald Trump, will announce later Tuesday that she now backs a formal inquiry, according to two Democratic sources close to her.

Pelosi's change of heart comes as dozens of House Democrats — now totaling more than two-thirds of the caucus — have come out in support of an impeachment inquiry in the wake of reports that Trump may have withheld aid to Ukraine to pressure officials there to investigate the son of political rival Joe Biden.

Pelosi is expected to announce the development following an all-caucus meeting she had called for 4:00 p.m. ET on Tuesday.

As of Tuesday afternoon, at least 166 Democrats supported some type of impeachment action — more than two-thirds of the 235-member caucus. An op-ed written by seven freshman House Democrats calling for impeachment hearings to address allegations about Trump and Ukraine had been expected to give Pelosi the "cover" she needed to back a more formal impeachment proceeding against the president, three sources familiar with the matter told NBC News on Monday night.

The impeachment drive follows days of revelations surrounding Trump's apparent push to have the Ukrainian government investigate the former vice president's son, Hunter Biden, who had business dealings in the country.

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Hunter Biden through the years
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Hunter Biden through the years
WASHINGTON, DC - APRIL 12: World Food Program USA Board Chairman Hunter Biden speaks on stage at the World Food Program USA's Annual McGovern-Dole Leadership Award Ceremony at Organization of American States on April 12, 2016 in Washington, DC. (Photo by Teresa Kroeger/Getty Images for World Food Program USA)
WASHINGTON, DC - APRIL 12: (L-R) U.S. Vice President Joe Biden, Hon. Dan Glickman, and Hunter Biden attend the World Food Program USA's Annual McGovern-Dole Leadership Award Ceremony at Organization of American States on April 12, 2016 in Washington, DC. (Photo by Teresa Kroeger/Getty Images for World Food Program USA)
WASHINGTON, DC - APRIL 12: World Food Program USA Board Chairman Hunter Biden (L) and U.S. Vice President Joe Biden attend the World Food Program USA's Annual McGovern-Dole Leadership Award Ceremony at Organization of American States on April 12, 2016 in Washington, DC. (Photo by Teresa Kroeger/Getty Images for World Food Program USA)
WASHINGTON, DC - APRIL 12: World Food Program USA Board Chairman Hunter Biden and Kathleen Biden arrive at the World Food Program USA's Annual McGovern-Dole Leadership Award Ceremony at Organization of American States on April 12, 2016 in Washington, DC. (Photo by Paul Morigi/Getty Images for World Food Program USA)
WASHINGTON, DC - APRIL 12: WFP USA Board Chair Hunter Biden speaks during the World Food Program USA's 2016 McGovern-Dole Leadership Award Ceremony at the Organization of American States on April 12, 2016 in Washington, DC. (Kris Connor/WireImage)
NEW YORK, NY - MAY 28: Hunter Biden attends the T&C Philanthropy Summit with screening of "Generosity Of Eye" at Lincoln Center with Town & Country on May 28, 2014 in New York City. (Photo by Astrid Stawiarz/Getty Images for Town & Country)
US Vice President Joe Biden (C) buys an ice-cream at a shop as he tours a Hutong alley with his granddaughter Finnegan Biden (R) and son Hunter Biden (L) in Beijing on December 5, 2013. Biden said on December 5 China's air zone had caused "significant apprehension" and Beijing needed to reduce Asia-Pacific tensions to protect its growing stake in regional peace and stability. AFP PHOTO / POOL / Andy Wong (Photo credit should read ANDY WONG/AFP/Getty Images)
BEIJING, CHINA - DECEMBER 04: U.S. Vice President Joe Biden waves as he walks out of Air Force Two with his granddaughter Finnegan Biden (C) and son Hunter Biden (R) at the airport December 4, 2013 in Beijing, China. Biden is on the first leg of his week-long visit to Asia. (Photo by Ng Han Guan-Pool/Getty Images)
WASHINGTON, DC - MAY 01: Second Lady Dr. Jill Biden and World Food Program USA Board Chair Hunter Biden taking the Live Below the Line Challenge, eating and drinking on $1.50 a day to raise awareness of global hunger and World Food Programme school feeding efforts around the world, at World Food Program USA on May 1, 2013 in Washington, DC. (Photo by Paul Morigi/WireImage)
President Barack Obama, left, Vice President Joe Biden, center, and Hunter Biden share a laugh during the first half of the NCAA basketball game between Georgetown and Duke at the Verizon Center in Washington, D.C., Saturday January 30, 2010. Georgetown defeated Duke, 89-77. (Photo by Chuck Myers/MCT/MCT via Getty Images)
WASHINGTON - OCTOBER 29: Hunter Biden (l) and actor Woody Harrelson pose for a photo at the after party following the 2nd Annual IMPACT Film Festival's screening of "The Messenger" at Posh on October 29, 2009 in Washington, DC. (Photo by Paul Morigi/WireImage)
U.S. Vice President Joe Biden (2R) arrives at Arlington National Cemetery with his wife Dr. Jill Biden (R), his son Hunter (L) and his daughter-in-law Kathleen for the internment services for U.S. Senator Edward Kennedy in Arlington, Virginia, August 29, 2009. Kennedy died late Tuesday after a battle with cancer. AFP PHOTO/POOL/Jim BOURG (Photo credit should read JIM BOURG/AFP/Getty Images)
WASHINGTON, D.C. - JANUARY 20: Vice-President Joe Biden arrives with his family, wife Jill, sons Hunter and Beau at the reviewing stand to watch the Inaugural Parade from in front of The White House January 20, 2009 in Washington, DC. Obama was sworn in as the 44th President of the United States, becoming the first African-American to be elected to the President in the US. (Photo by Alex Wong/Getty Images)
WASHINGTON, DC - JANUARY 19: Hunter Biden and guest attend the Artists And Athletes Alliance red carpet event at Inaugural Honors ServiceNation, held at Cafe Milano in Georgetown January 19, 2009 Washington, DC. (Photo by Logan Mock-Bunting/Getty Images)
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On Monday, The Washington Post and other media outlets reported that Trump instructed his acting chief of staff to place a hold on about $400 million in military aid for Ukraine in the days before a late July phone call with Ukrainian President Volodymyr Zelensky.

Over the weekend, Trump admitted he discussed Biden, a possible 2020 challenger, with Zelensky. On Tuesday, he said he would release the transcript of the call and confirmed reports that his administration temporarily froze almost $400 million in aid to Ukraine. But he gave a new reason for doing so: He said he wanted European countries to contribute money, too, and did not want the United States to do so alone.

Trump on Tuesday also denied putting any pressure on the Ukrainian leader to probe a political rival.

"I put no pressure on them whatsoever," he said. "I could have. I think it would probably, possibly have been OK if I did. But I didn't. I didn't put any pressure on them whatsoever."

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