U.S. President Barack Obama, left, shakes hands and chats with Sunao Tsuboi, second right, a survivor of the 1945 atomic bombing and chairman of the Hiroshima Prefectural Confederation of A-bomb Sufferers Organization (HPCASO), as Japanese Prime Minister Shinzo Abe watches them during his visit to Hiroshima Peace Memorial Park in Hiroshima, western Japan, Friday, May 27, 2016. Obama on Friday beca