US President Barack Obama (R) and Japanese Prime Minister Shinzo Abe shake hands after laying wreaths at the Hiroshima Peace Memorial Park in Hiroshima on May 27, 2016. ( JIM WATSON/AFP/Getty Images)
Obama Visits Hiroshima Peace Park
Japanese Prime Minister Shinzo Abe (L) looks on as US President Barack Obama (R) lays a wreath during a visit to the Hiroshima Peace Memorial Park in Hiroshima on May 27, 2016.
(JIM WATSON/AFP/Getty Images)
Obama Visits Hiroshima Peace Park
US President Barack Obama places a wreath at the cenotaph in the Peace Momorial park in Hiroshima on May 27, 2016 with Japanese Prime Minister Shinzo Abe.
Obama on May 27 paid a moving tribute to victims of the world's first nuclear attack. ( TOSHIFUMI KITAMURA/AFP/Getty Images)
Obama Visits Hiroshima Peace Park
US President Barack Obama (L) and Japanese Prime Minister Shinzo Abe (R) walk beside the cenotaph in the Peace Momorial park in Hiroshima on May 27, 2016. (TOSHIFUMI KITAMURA/AFP/Getty Images)
Obama Visits Hiroshima Peace Park
US President Barack Obama (L) shakes hands with Japanese Prime Minister Shinzo Abe (R) after laying a wreath at the cenotoph in the Peace Momorial park in Hiroshima on May 27, 2016.
Obama became the first sitting US leader to visit the site that ushered in the age of nuclear conflict. (Photo credit should read TOSHIFUMI KITAMURA/AFP/Getty Images)
Obama Visits Hiroshima Peace Park
US Presdent Barack Obama (R) shakes hands with Japanese Prime Minister Shinzo Abe (L) after laying a wreath in front of the cenotaph to offer a prayer for victims of the atomic bombing in 1945 at Hiroshima Peace Memorial Park in Hiroshima on May 27, 2016.
(KIMIMASA MAYAMA/AFP/Getty Images)
Obama Visits Hiroshima Peace Park
US President Barack Obama hugs Shigeaki Mori (front), a survivor of the 1945 atomic bombing of Hiroshima, during a visit to the Hiroshima Peace Memorial Park on May 27, 2016.
Obama on May 27 paid moving tribute to victims of the world's first nuclear attack.
/ AFP / JIM WATSON (Photo credit should read JIM WATSON/AFP/Getty Images)
Obama Visits Hiroshima Peace Park
People try to get a glimpse of the wreath laid by US President Obama at the Hiroshima Peace Memorial park cenotaph in Hiroshima on May 27, 2016.
( JOHANNES EISELE/AFP/Getty Images)
Obama Visits Hiroshima Peace Park
US President Barack Obama (C) greets a school student as Japanese Prime Minister Shinzo Abe watches (L) after delivering their speeches and laying wreaths in front of a cenotaph to offer a prayer for victims of the atomic bombing in 1945, at Hiroshima Peace Memorial Park in Hiroshima on May 27, 2016.
(KIMIMASA MAYAMA/AFP/Getty Images)
