SHIMA, Japan — On the eve of his historic trip to Hiroshima, President Barack Obama is defending the vigor of his efforts to rid the world of nuclear weapons. He says he will use his visit to the Japanese memorial site on Friday to underscore "the sense of urgency that we all should have."
Obama, who began his administration with an audacious call for a nuclear-free world, acknowledged there still is much to be done. In fact, some critics maintain the world is further away from Obama's goal now than it was at the start of his presidency.
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