Special Counsel investigation into Russia's interference in 2016 U.S. Elections

House Judiciary Committee Chairman Jerrold Nadler, D-N.Y., looks over noters as he joins House Democrats before passing the Voting Rights Advancement Act to eliminate potential state and local voter suppression laws, at the Capitol in Washington, Friday, Dec. 6, 2019. House Speaker Nancy Pelosi announced on Wednesday that she is asking Nadler move forward with drafting articles of impeachment against President Trump. (AP Photo/J. Scott Applewhite)

In this Dec. 5, 2019, photo, President Donald Trump speaks at a luncheon with members of the United Nations Security Council in the Cabinet Room at the White House in Washington. (AP Photo/Andrew Harnik)

President Donald Trump steps off Marine One upon arrival at Andrews Air Force Base, Md., Saturday, Dec. 7, 2019, en route to Florida to attend a Republican fundraiser and speak at the Israeli American Council National Summit. ( AP Photo/Jose Luis Magana)

FILE - In this March 7, 2019, file photo, House Judiciary Committee Chairman Jerrold Nadler, D-N.Y., and Speaker of the House Nancy Pelosi, D-Calif., speak to reporters at the Capitol in Washington. The House Judiciary Committee is moving to the forefront of President Donald Trump’s impeachment, starting with a hearing Wednesday, Dec. 4 to examine the “high crimes and misdemeanors” set out in the Constitution. (AP Photo/J. Scott Applewhite, File)

Speaker of the House Nancy Pelosi, D-Calif., meets with reporters during her weekly news conference at the Capitol in Washington, Thursday, Dec. 5, 2019. (AP Photo/J. Scott Applewhite)

FILE - In this Aug. 15, 2019, file photo, former New York City Mayor Rudy Giuliani smiles as he arrives to President Donald Trump's campaign rally in Manchester, N.H. Federal prosecutors are planning to interview an executive with Ukraine’s state-owned gas company as part of an ongoing probe into the business dealings of Giuliani and two of his Soviet-born business associates. (AP Photo/Elise Amendola, File)

FILE - In this June 20, 2017, file photo, Deputy Attorney General Rod Rosenstein listens during the Justice Department's National Summit on Crime Reduction and Public Safety in Bethesda, Md. Former Deputy Attorney General Rosenstein told the FBI he was "angry, ashamed, horrified and embarrassed" at the way James Comey was fired as FBI director. An FBI summary of that interview was among hundreds of pages of documents released Monday, Dec. 2, 2019, as part of a public records lawsuit brought by BuzzFeed News and CNN. (AP Photo/Jacquelyn Martin, File)

Photo by Mark Wilson/Getty Images

FILE - In this July 25, 2019, file photo, President Donald Trump reviews the troops during a full honors welcoming ceremony for Secretary of Defense Mark Esper at the Pentagon in Washington. If there was one day that crystallized all the forces that led to the impeachment investigation of President Donald Trump, it was July 25. That was the day of his phone call with Ukraine’s new leader, pressing him for a political favor. (AP Photo/Alex Brandon, File)

FILE - In this Sept. 27, 2018, file photo, then-White House counsel Don McGahn listens as Supreme court nominee Brett Kavanaugh testifies before the Senate Judiciary Committee on Capitol Hill in Washington. A federal judge has ordered McGahn to appear before Congress in a setback to President Donald Trump’s effort to keep his top aides from testifying. The outcome could lead to renewed efforts by House Democrats to compel testimony from other high-ranking officials, including former national security adviser John Bolton. (Saul Loeb/Pool Photo via AP, File)