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

FILE - In this March 22, 2019 file photo, an American flag flies outside the Department of Justice in Washington. (AP Photo/Andrew Harnik)

FILE - In this Feb. 1, 2017 file photo, then-National Security Adviser Michael Flynn speaks during the daily news briefing at the White House, in Washington. A former federal judge appointed to review the Justice Department's motion to dismiss criminal charges against ex-national security Michael Flynn has found that the government's request should be denied because there is “clear evidence of a gross abuse of prosecutorial power.” Former U.S. District Judge John Gleeson says in a filing Wednesday that the government “has engaged in highly irregular conduct to benefit a political ally of the President.” (AP Photo/Carolyn Kaster, File)

FILE - In this Sept. 4, 2018 file photo, White House counsel Don McGahn, listens as he attends a confirmation hearing for Supreme Court nominee Brett Kavanaugh before the Senate Judiciary Committee on Capitol Hill in Washington. A federal appeals court in Washington has revived House Democrats’ lawsuit to force former White House counsel Don McGahn to appear before a congressional committee. But the court's action Friday left other legal issues unresolved with time growing short in the current Congress. (AP Photo/Jacquelyn Martin)

FILE - In this Dec. 18, 2018, file photo, President Donald Trump's former National Security Advisor Michael Flynn arrives at federal court in Washington. A former federal judge appointed to review the Justice Department's motion to dismiss criminal charges against ex-national security Michael Flynn has found that the government's request should be denied because there is “clear evidence of a gross abuse of prosecutorial power.” Former U.S. District Judge John Gleeson says in a filing Wednesday that the government “has engaged in highly irregular conduct to benefit a political ally of the President.” (AP Photo/Carolyn Kaster, File)

Attorney General William Barr listens during a House Judiciary Committee hearing on the oversight of the Department of Justice as a video plays in the background on Capitol Hill, Tuesday, July 28, 2020 in Washington. (Chip Somodevilla/Pool via AP)

This cover image released by Houghton Mifflin Harcourt Books & Media shows "Compromised Counterintelligence and the Threat of Donald J. Trump" by Peter Strzok. (Houghton Mifflin Harcourt Books & Media via AP)

FILE - In this June 15, 2020, file photo Attorney General William Barr speaks during a roundtable with President Donald Trump about America's seniors, in the Cabinet Room of the White House in Washington. Barr is scheduled to appear for the first time before the House Judiciary Committee on Tuesday, July 28. (AP Photo/Evan Vucci, File)

FILE - In this Nov. 7, 2019, file photo, Roger Stone arrives at federal court in Washington. (AP Photo/Cliff Owen, File)

This photo provided by Random House shows the cover of Andrew Weissmann’s "Where Law Ends: Inside the Mueller Investigation." A lead prosecutor for special counsel Robert Mueller has a book coming about the two-year investigation into the alleged ties between Russia and the presidential campaign of Donald Trump. Random House announced Monday, July 13, 2020, that “Where Law Ends” will be published Sept. 29. (Random House via AP)

FILE - In this Wednesday, July 24, 2019, file photo, former special counsel Robert Mueller testifies before the House Intelligence Committee hearing on his report on Russian election interference, on Capitol Hill, in Washington. Mueller sharply defended his investigation into ties between Russia and Donald Trump's 2016 presidential campaign, writing in a newspaper opinion piece Saturday, July 11, 2020, that the probe was of “paramount importance” and asserting that a Trump ally, Roger Stone, “remains a convicted felon, and rightly so" despite the president's decision to commute his prison sentence. (AP Photo/Alex Brandon, File)