WASHINGTON, DC - JANUARY 12: (AFP OUT) U.S. President Barack Obama delivers remarks at a tribute to Vice-President Joe Biden (L) during an event in the State Dining room of the White House, January 12, 2017 in Washington, DC. Obama presented the Medal of Freedom to Vice President Joe Biden. (Photo by Olivier Douliery-Pool/Getty Images)
Commandant of the Marine Corps Gen. Robert B. Neller speaks with Marines with Task Force Southwest at Bost Airfield, Afghanistan, June 20, 2017. Picture taken June 20, 2017. Courtesy Justin T. Updegraff/U.S. Marine Corps/Handout via REUTERS ATTENTION EDITORS - THIS IMAGE HAS BEEN SUPPLIED BY A THIRD PARTY.
LOS ANGELES, CA - SEPTEMBER 17: Actor Kate McKinnon accepts the Outstanding Supporting Actress in a Comedy Series award for 'Saturday Night Live' onstage during the 69th Annual Primetime Emmy Awards at Microsoft Theater on September 17, 2017 in Los Angeles, California. (Photo by Jeff Kravitz/FilmMagic)
BIRCH RUN, MI - AUGUST 11: Republican presidential candidate Donald Trump speaks at a press conference before delivering the keynote address at the Genesee and Saginaw Republican Party Lincoln Day Event August 11, 2015 in Birch Run, Michigan. This is Trump's first campaign event since his Republican debate last week. (Photo by Bill Pugliano/Getty Images)
WASHINGTON, DC - OCTOBER 23: U.S. President Donald Trump listens to Singapore Prime Minister Lee Hsien Loong as they deliver joint statements in the Rose Garden of the White House October 23, 2017 in Washington, DC. Trump and Lee are meeting ahead of Trump's first official visit to Asia to attend the APEC and ASEAN meetings during the first two weeks of November. (Photo by Chip Somodevilla/Getty Images)
German Chancellor Angela Merkel, top candidate of the Christian Democratic Union Party (CDU) for the upcoming general elections, waves to supporters during an election rally in Regensburg, Germany, September 18, 2017. REUTERS/Michael Dalder
Republican U.S. presidential nominee Donald Trump and Democratic U.S. presidential nominee Hillary Clinton stand together at the start of their presidential town hall debate at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Lucy Nicholson
WASHINGTON, DC - JANUARY 20: President Barack Obama leaves the Oval Office for the last time as President, in Washington, D.C. on January 20, 2017. Later today President-Elect Donald Trump will be sworn-in as the 45th President. (Photo by Kevin Dietsch-Pool/Getty Images)