FILE - In this Oct. 4, 2009 file photo, U.S. Ambassador to Japan ...

FILE - In this Oct. 4, 2009 file photo, U.S. Ambassador to Japan John Roos, center, and Hiroshima Mayor Tadatoshi Akiba, left, pray for the victims of the atomic bombing at the Memorial Cenotaph for A-Bomb Victims at Peace Memorial Park in Hiroshima, western Japan. In an interview with Japanese broadcaster NHK that ran Tuesday, Nov. 10, 2009, President Barack Obama said he would be unable to visit Hiroshima and Nagasaki on his trip to Japan this weekend due to time constraints but would be willing to do so in the future. A woman at right is unidentified.