Donald Trump impersonator Robert S. Ensler speaks on a phone before the presidential hopeful holds a rally in Las Vegas on Monday, December 14.
U.S. Sen. Bernie Sanders, who is seeking the Democratic Party's nomination, leaves a Washington mosque on Wednesday, December 16. Sanders attended an interfaith discussion on standing up to anti-Muslim rhetoric.
Arizona Secretary of State Michele Reagan uses a lottery machine on Tuesday, December 15, to decide where presidential candidates will appear on the state's ballots.
Republican presidential candidate Sen. Ted Cruz is seen through Christmas lights as he speaks during a campaign event on Friday, December 18, in Kennesaw, Georgia.
White House press secretary Josh Earnest speaks in the briefing room on December 18, with "Star Wars" characters R2-D2 and Storm Troopers.
House Speaker Paul Ryan calls on a reporter during an end-of-the-year news conference in Washington on Thursday, December 17.
Journalists stand at the entrance of the National Counterterrorism Center in McLean, Virginia, on Thursday, December 17.
Clinton smiles as she walks past Sanders during a commercial break at the Democratic debate held in Manchester, New Hampshire, on Saturday, December 19.
Stephen Orzechowski, 6, points to Santa Claus as first lady Michelle Obama reads "The Night Before Christmas" to children in Washington on Monday, December 14.
U.S. Rep. Jason Chaffetz, chairman of the House Committee on Oversight and Government Reform, swears in two Homeland Security officials to testify about terrorism safeguards on Thursday, December 17. The committee wants to ensure that would-be extremists are not exploiting a variety of legal paths to travel to the United States.