Deputy Director of Naval Intelligence Scott Bray, left, and Under Secretary of Defense for Intelligence and Security Ronald Moultrie speak Tuesday during a House Intelligence, Counterterrorism, Counterintelligence, and Counterproliferation Subcommittee hearing on "Unidentified Aerial Phenomena" on Capitol Hill in Washington. Alex Brandon/AP hide caption
CIA Director William Burns told the House Intelligence Committee that he believes Russian President Vladimir Putin is "angry and frustrated" by the slow pace of Russia's invasion of Ukraine. Burns said he expects Putin to "double down," which could lead to heavy fighting for control of Ukraine's cities in the coming weeks. Susan Walsh/AP hide caption
House Intelligence Committee Chairman Adam Schiff, D-Calif., has said he could decide to amend the panel's report on its impeachment investigation if new evidence is discovered. Manuel Balce Ceneta/AP hide caption
House Intelligence Chairman Rep. Adam Schiff of California speaks to the media last month. Schiff is leading the charge in the impeachment inquiry into President Trump. Mark Wilson/Getty Images hide caption
Rep. Devin Nunes, R-Calif., leaves a meeting on Capitol Hill in January. The House Intelligence Committee chairman is locked in a fierce re-election battle. Mark Wilson/Getty Images hide caption
House intelligence committee ranking member Rep. Adam Schiff, D-Calif., speaks to reporters Tuesday on Capitol Hill, joined by other Democrats on the committee as they released a response to GOP conclusions on the House Russia investigation. Susan Walsh/AP hide caption
House intelligence committee Chairman Devin Nunes, R-Calif., speaks to reporters at the Capitol last year. Nunes is at the center of a political firestorm over the release of a memo critiquing FBI surveillance. Win McNamee/Getty Images hide caption
House Intelligence Committee Chairman Devin Nunes, R-Calif., speaks while flanked by and Rep. Don DeSantis, R-Fla., as he announces that his committee and the House oversight committee are starting an investigation into a 2010 deal between Russia and the Obama Administration. Mark Wilson/Getty Images hide caption
Roger Stone (right), a former adviser to President Trump, arrives to appear before the House Intelligence Committee on Tuesday. Stone flatly denied any accusations of collusion between Russia and the Trump campaign. Mark Wilson/Getty Images hide caption
Leading members of the House Intelligence Committee's Russia investigation, Republican Rep. Mike Conaway (left) and Democratic Rep. Adam Schiff, said Thursday that the committee is not satisfied with the White House response to whether there are tapes or records of the president's Comey meetings. Alex Brandon/AP hide caption
Sens. Mark Warner, D-Va., and Richard Burr, R-N.C., lead the Senate Intelligence Committee, which is investigating Russian meddling in the 2016 presidential election. Tasos Katopodis/AFP/Getty Images hide caption
Former acting U.S. Attorney General Sally Yates, who had warned the Trump administration about Michael Flynn's Russia ties, was fired by President Trump in late January over another controversy. Pete Marovich/Getty Images hide caption
Mark Warner (from left) of Virginia, the top Democrat on the Senate Intelligence Committee, and Republican Chairman Richard Burr of North Carolina listen to testimony during a March 30 hearing in Washington, D.C. Win McNamee/Getty Images hide caption
Rep. Mike Conaway, R-Texas, will take over the House Intelligence Committee's investigation into Russian attempts to influence the 2016 presidential election, at least temporarily. Bill Clark/CQ-Roll Call, Inc./Getty Images hide caption
Former national security adviser Michael Flynn's lawyer says Flynn has offered to testify about Trump campaign contacts with Russia if he gets immunity from prosecution. Flynn is seen at the White House on Feb. 13. Evan Vucci/AP hide caption
House Intelligence Committee chairman Rep. Devin Nunes (R-CA) walks to the House floor on Capitol Hill on Friday. Nunes has been challenged by his colleagues about over how he acquired and handled classified information that he didn't share with the rest of the committee. Drew Angerer/Getty Images hide caption
President Trump speaks to the media in the Oval Office on Friday. Pablo Martinez Monsivais/AP hide caption
Devin Nunes, R-Calif., chairman of the House Intelligence Committee, speaks to the media about the investigation of Russian meddling in the 2016 presidential election on Capitol Hill in Washington, D.C., on Friday. Nicholas Kamm/AFP/Getty Images hide caption
Ranking committee member Adam Schiff, D-Calif. (left), and Chairman Devin Nunes, R-Calif., prepare to take their seats on Monday at a House Permanent Select Committee on Intelligence hearing concerning Russian meddling in the 2016 U.S. election. Drew Angerer/Getty Images hide caption
Edward Snowden, who is in Moscow, is seen on a giant screen during a live video conference for an interview as part of an Amnesty International event in Paris in December 2014. The House Permanent Select Committee on Intelligence published a summary report accusing Snowden of causing "tremendous damage to U.S. national security." Charles Platiau/AP hide caption
Demonstrators hold signs supporting Edward Snowden in New York's Union Square Park, on Monday. Snowden, who says he worked as a contractor at the National Security Agency and the CIA, gave classified documents to reporters, making public two sweeping U.S. surveillance programs and touching off a national debate on privacy versus security. Richard Drew/AP hide caption