Sen. John F. Kerry caught President Bush off guard during their final debate Wednesday night, asserting that the president once said he was "not that concerned" about hunting down Al Qaeda leader Osama bin Laden. In one of the testiest moments of the evening, Bush protested, "I don't think I ever said I'm not worried about Osama bin Laden. That's kind of one of those exaggerations." But during a news conference at the White House on March 13, 2002, Bush said something close to what Kerry quoted. "I truly am not that concerned about him," the president said, according to the official White House transcript.