U.S. President Barack Obama will cite his country's "moral responsibility" to lead efforts to create a world free of nuclear weapons when he visits Hiroshima next week, one of his top speechwriters said Wednesday.

Obama, who plans to make brief remarks during his visit to the city, the site of an atomic bomb attack during World War II, will "absolutely" touch on the United States' moral responsibility as the only nation to have used a nuclear weapon during a time of war, Deputy National Security Adviser for Strategic Communications and Speechwriting Ben Rhodes told Kyodo News in an interview.

"We have said that we have a unique and moral responsibility as the only country that's used a nuclear weapon to prevent the future use of nuclear weapons," Rhodes said.