Senate Majority Leader Mitch McConnell (R-KY) walks from the Senate Floor to his office at the Capitol Building in Washington, D.C on Thursday, May 7, 2015. (Zach Gibson / The New York Times
Martin Shkreli, the former chief executive of Turing Pharmaceuticals, reacts as Rep. Elijah Cummings (D-Md.) spoke during a hearing before the House Oversight and Government Reform Committee, on Capitol Hill, in Washington, Feb. 4, 2016. Shkreli, who is facing federal securities fraud charges, repeatedly exercised his Fifth Amendment right to avoid self-incrimination, infuriating members of the committee.(Zach Gibson / The New York Times)
Former FBI Director Robert Mueller, special counsel on the Russian investigation leaves the U.S. Capitol Building following a meeting with members of the Senate Judiciary Committee in Washington, D.C., U.S., on Tuesday, June 20, 2017. (Zach Gibson / Bloomberg)
Former FBI Director James Comey is sworn in before testifying to the Senate Intelligence Committee in Washington, D.C., U.S., on Thursday, June 8, 2017. Comey in prepared remarks to the committee said U.S. President Donald Trump sought his loyalty and urged him to drop the investigation into former National Security Advisor Michael Flynn. (Zach Gibson/Bloomberg)
Sen. Bernie Sanders (I-VT) speaks to House Minority Leader Nancy Pelosi (D-CA) outside of a Democratic Caucus at The Capitol Building in Washington, D.C., on July 6, 2016. (Zach Gibson / The New York Times)
Pope Francis addresses a joint meeting of Congress at the Capitol in Washington, D.C., Sept. 24, 2015. (Zach Gibson / The New York Times)
Sen. Orrin Hatch (R-UT) speaks during a Senate Finance Committee meeting to vote on the nominations of Secretary of Health and Human Services-designate Tom Price and Treasury Secretary-designate Steve Mnuchin on Capitol Hill in Washington, DC, on February 1, 2017. After Senate Democrats boycotted the meeting two days in a row, the Senate Republicans on the committee suspended committee rules and voted on Mnuchin and Price without Democrats. (Zach Gibson / Agence France-Presse)
The U.S. Capitol Dome is pictured behind flags at half-staff following the death of Supreme Court Justice Antonin Scalia on Monday, February 15, 2017 in Washington, D.C. (Zach Gibson / The New York Times)
Senator Jeff Flake (R-AZ) meets with members of the Cheetah Conservation Fund during a briefing on wildlife poaching on Capitol Hill on Monday, April 25, 2017 in Washington, D.C. (Zach Gibson / The New York Times)
Sen. Ted Cruz (R-Texas), back on Capitol Hill after suspending his presidential primary campaign, speaks to reporters in Washington, May 10, 2016. In his first interview since leaving the Republican presidential race last week, Cruz declined to throw his support behind Trump. (Zach Gibson/The New York Times)
Sen. Ted Cruz speaks at a rally against the Iran Nuclear Deal on The West Lawn on Capitol Hill in Washington D.C. on Wednesday, September 9, 2015. (Photo by Zach Gibson / The New York Times)
Sen. Ted Cruz (R-Texas) holds a news conference outside a restaurant in Washington, March 22, 2016. (Zach Gibson / The New York Times)
House Speaker John Boehner (R-OH) speaks during a press conference announcing his resignation at The Capitol Building in Washington D.C., on Friday, September 25, 2015. (Photo by Zach Gibson / The New York Times)
Sir Elton John arrives to testify at a Senate Appropriations subcommittee hearing on State Department global health programs, in Washington, May 6, 2015. (Zach Gibson / The New York Times)
The U.S. Capitol Building is pictured January 9, 2017 in Washington, DC.
Supreme Court Nominee Neil Gorsuch is pictured during a meeting with Sen. Joe Manchin (D-WV) on Capitol Hill in Washington, DC, on February 1, 2017. (Zach Gibson / Agence France-Presse)
Bono, lead singer of U2 and cofounder, ONE and (RED), during a subcommittee hearing of the Senate Appropriations Committee about violent extremism and the role of foreign assistance on Capitol Hill, in Washington, April 12, 2016. (Zach Gibson/The New York Times)
House Minority Leader Nancy Pelosi (D-CA) speaks during a weekly press conference at the Capitol Building in Washington, D.C., on Thursday, May 19, 2016. (Photo by Zach Gibson / The New York Times)
Rep. Paul Ryan (R-WI) walks down the House Steps after adjourning for August Recess at The Capitol Building in Washington D.C. on Wednesday, July 29, 2015.