White House press secretary Josh Earnest and Stormtroopers wait for R2-D2 to enter the briefing room after President Barack Obama finished his end of the year news conference at the White House in Washington. The Star Wars characters were at the White House for a private screening of "Star Wars: The Force Awakens", which was shown to first lady Michelle Obama and Gold Star Families. REUTERS/Kevin Lamarque 

Olivia Wong, age 3, mimics her father Scott Wong (R) of The Hill newspaper after he raised his hand to ask a question during House Speaker Paul Ryan's weekly news conference, on Take Our Daughters and Sons to Work Day at the Capitol. REUTERS/Jonathan Ernst 

White House Press Secretary Josh Earnest and actress Allison Janney, who played a fictional press secretary in "The West Wing" television show, stand together at the lectern before the daily press briefing. REUTERS/Jonathan Ernst 

White House Press Secretary Robert Gibbs takes off a Canadian Olympic team hockey jersey during his news briefing. Gibbs lost a bet he made with Canadian Prime Minister Stephen Harper's spokesman Dimitri Soudas on the Vancouver 2010 Olympics gold medal game's result between Canada and the United States where the Canadians won 3-2 in overtime. REUTERS/Jim Young 

Wearing Chicago Cubs attire, actor Bill Murray takes to the lectern in the briefing room during a visit to the White House in Washington, U.S., October 21, 2016. REUTERS/Kevin Lamarque 

The left hand of White House Press Secretary Robert Gibbs shows a shopping list featuring "Eggs, Milk, Hope and Change", the latter two words used heavily in President Barack Obama's 2008 presidential campaign, during Gibbs' daily news briefing. REUTERS/Jason Reed 

President Barack Obama puts his arm around Hearst White House columnist Helen Thomas after presenting her with cupcakes in honor of her birthday in the James Brady Briefing Room. REUTERS/Jim Young 

Actor Will Arnett gets boxes of M&M's candy with the presidential seal as he and Amy Poehler take a tour of the press briefing room. REUTERS/Jonathan Ernst 

White House Press Secretary Robert Gibbs holds up a document at the daily press briefing. REUTERS/Jim Young 

President Barack Obama takes questions from journalism students in the briefing room. REUTERS/Joshua Roberts 

Actress Glenn Close (R), Michigan Senator Debbie Stabenow (L) and White House senior advisor Valerie Jarrett conclude a TV interview in the Brady Briefing Room. Close was at the White House to speak at the National Conference on Mental Health. REUTERS/Kevin Lamarque 

Olive Werner, age 4, watches her mother Erica Werner of the Associated Press ask a question during House Speaker Paul Ryan's weekly news conference on Take Our Daughters and Sons to Work Day. REUTERS/Jonathan Ernst 

White House press secretary Robert Gibbs reacts as veteran CBS White House Correspondent Bill Plante gets up and walks out of the room after receiving a phone call during the daily press briefing. Several journalists phones rang during the briefing, disrupting Gibbs' briefing. REUTERS/Jason Reed 

White House Press Secretary Robert Gibbs holds up a photograph of President Barack Obama blocking a shot by his personal aide Reggie Love at a basketball game, during the press briefing. REUTERS/Jim Young 

New Orleans Saints offensive tackle Zach Strief (2nd R) is joined by other members of his team as he serves Louisiana-style food to White House Chef Sam Kass (L) and members of the media in the briefing room. REUTERS/Jason Reed 

A man dressed as Santa Claus walks through the press briefing room. REUTERS/Jim Young 

White House Press Secretary Robert Gibbs conducts his daily briefing for the first time in the Rose Garden of the White House. Gibbs said he moved the briefing to the outdoors for the first time to take advantage of warmer springtime weather. REUTERS/Jason Reed