The White House sounded cautious Thursday about the possibility of President Barack Obama visiting Hiroshima or Nagasaki, the Japanese cities attacked with atomic bombs in World War II, during his tenure.

Josh Earnest, the White House press secretary, told reporters that he does not rule out the possibility of Obama visiting the cities "in the future." But he suggested the fact that Obama did not visit the cities during any of his past three visits to Japan as U.S. leader is indicative of his administration's position.

Earnest made the comments answering questions by reporters on the 70th anniversary of the bombing of Hiroshima on Aug. 6, 1945 about whether Obama would become the first sitting U.S. president to visit Hiroshima or Nagasaki.