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WASHINGTON, DC - DECEMBER 21: Federal Bureau of Investigation Deputy Director Andrew McCabe (2nd L) is escorted by U.S. Capitol Police before a meeting with members of the Oversight and Government Reform and Judiciary committees in the Rayburn House Office Building December 21, 2017 in Washington, DC. McCabe testified before the House Intelligence Committee for ten hours on Tuesday. (Photo by Chip Somodevilla/Getty Images)

WASHINGTON, DC - DECEMBER 21:  Federal Bureau of Investigation Deputy Director Andrew McCabe (2nd L) is escorted by U.S. Capitol Police before a meeting with members of the Oversight and Government Reform and Judiciary committees in the Rayburn House Office Building December 21, 2017 in Washington, DC. McCabe testified before the House Intelligence Committee for ten hours on Tuesday.  (Photo by Chip Somodevilla/Getty Images)

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WASHINGTON, DC - JANUARY 20: Director of the Federal Bureau of Investigation Robert Mueller testifies at a Senate Judiciary Hearing focusing on the attempted bombing incident on Northwest Flight 253 January 20, 2009 in Washington, DC. The committee's goal is to improve the effectiveness of anti-terrorism tools and inter-agency communication in an attempt to increase airline safety after the attempted Christmas bombing of the flight. (Photo by Ann Heisenfelt/Getty Images)

WASHINGTON, DC - JANUARY 20:  Director of the Federal Bureau of Investigation Robert Mueller  testifies at a Senate Judiciary Hearing focusing on the attempted bombing incident on Northwest Flight 253 January 20, 2009 in Washington, DC. The committee's goal is to improve the effectiveness of anti-terrorism tools and inter-agency communication in an attempt to increase airline safety after the attempted Christmas bombing of the flight.  (Photo by Ann Heisenfelt/Getty Images)

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Hillary Clinton, 2016 Democratic presidential nominee, waves to attendees while taking the stage during a campaign event in Cleveland, Ohio, U.S., on Monday, Oct. 31, 2016. As Clinton's allies went on the attack against FBI Director James Comey, the White House defended the FBI chief against allegations from some Democrats that he's trying to interfere with the election. Photographer: Ty Wright/Bloomberg via Getty Images

Hillary Clinton, 2016 Democratic presidential nominee, waves to attendees while taking the stage during a campaign event in Cleveland, Ohio, U.S., on Monday, Oct. 31, 2016. As Clinton's allies went on the attack against FBI Director James Comey, the White House defended the FBI chief against allegations from some Democrats that he's trying to interfere with the election. Photographer: Ty Wright/Bloomberg via Getty Images

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DALLAS, TX - SEPTEMBER 14: Republican presidential candidate Donald Trump speaks during a campaign rally at the American Airlines Center on September 14, 2015 in Dallas, Texas. More than 20,000 tickets have been distributed for the event. (Photo by Tom Pennington/Getty Images)

DALLAS, TX - SEPTEMBER 14:  Republican presidential candidate Donald Trump speaks during a campaign rally at the American Airlines Center on September 14, 2015 in Dallas, Texas. More than 20,000 tickets have been distributed for the event.  (Photo by Tom Pennington/Getty Images)

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WASHINGTON, DC - MAY 11: Acting FBI Director Andrew McCabe waits for the beginning of a hearing before the Senate Intelligence Committee with the other heads of the U.S. intelligence agencies in the Hart Senate Office Building on Capitol Hill May 11, 2017 in Washington, DC. The intelligence officials were questioned by the committee during the annual hearing about world wide threats to United States' security. (Photo by Alex Wong/Getty Images)

WASHINGTON, DC - MAY 11:  Acting FBI Director Andrew McCabe waits for the beginning of a hearing before the Senate Intelligence Committee with the other heads of the U.S. intelligence agencies in the Hart Senate Office Building on Capitol Hill May 11, 2017 in Washington, DC. The intelligence officials were questioned by the committee during the annual hearing about world wide threats to United States' security.  (Photo by Alex Wong/Getty Images)