Barak Obama

U.S. President Barack Obama (R) puts his arm around Japanese Prime Minister Shinzo Abe after they laid wreaths in front of a cenotaph at Hiroshima Peace Memorial Park in Hiroshima, Japan May 27, 2016. REUTERS/Carlos Barria

Carlos Barria/Reuters

U.S. President Barack Obama puts his arm around Japanese Prime Minister Shinzo Abe after they laid wreaths in front of a cenotaph at Hiroshima Peace Memorial Park in Hiroshima, Japan 

U.S. President Barack Obama, with bags slung over his shoulders, delivers toys and gifts donated by Executive Office of the President staff to the Marine Corps Reserve Toys for Tots Program at Joint Base Anacostia-Bolling.

Chip Somodevilla/Getty Images

U.S. President Barack Obama, with bags slung over his shoulders, delivers toys and gifts donated by Executive Office of the President staff to the Marine Corps Reserve Toys for Tots Program at Joint Base Anacostia-Bolling.

Barack Obama,  Natalia Brzezinski, Mark Brzezinski...U.S. President Barack Obama, right, is greeted by U.S. Ambassador Mark Brzezinski, center, and his wife Natalia Brzezinski, left, upon his arrival at Stockholm-Arlanda International Airport, Wednesday, Sept. 4, 2013, in Stockholm, Sweden. (AP Photo/Pablo Martinez Monsivais)

Pablo Martinez Monsivais/AP

US President Barack Obama, right, is greeted by Mark Brzezinski, US ambassador, centre, and his wife Natalia Brzezinski, left, upon his arrival at Stockholm-Arlanda International Airport on Wednesday in Stockholm, Sweden