GIBSON: So let me start with what is generally agreed to be, I think, the greatest threat to the United States today, and, somewhat to my surprise, has not been discussed as much in the presidential debates this year as I thought would be, and that is nuclear terrorism.
And for some background, here's ABC's Chief Investigative Correspondent Brian Ross.
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BRIAN ROSS, ABC CHIEF INVESTIGATIVE CORRESPONDENT: After more than six years of trying, the United States still does not have a reliable way to spot nuclear material that terrorists might smuggle into the country, much as ABC News twice did in demonstrations without being caught.
And after six years of trying, the United States has yet to capture the man who says it is his religious duty to get nuclear weapons: Osama bin Laden.
And in the last 18 months, U.S. officials say his Al Qaida has regrouped using safe havens along the Pakistani border to train and dispatch hundreds of new recruits.
ROSS: And just as troubling, amidst all the turmoil in Pakistan, the influence of bin Laden continues to grow there, a country with many nuclear weapons.
Charlie?
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GIBSON: Brian Ross there.
Well, Osama bin Laden, as he pointed out, has said it is his duty to try to get nuclear weapons. Al Qaida has been recons uted and re-energized in the western part of Pakistan.
And so my general question is, how aggressively would you go after Al Qaida leadership there?