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What should the U.S. president do? What would you do if you were the President?
Obey the law. I don't care if the President really, honestly believed that burning holes in Atta's scrotum with a solder gun would yield the identity of the other 18 hijackers. Separate from the fact that he has no way of knowing that, it's against the law. It is morally wrong and it is legally wrong.
Again, though... the fact that you can construct an elaborate scenario of vanishingly small probability that is so alarming that you are tempted to break the laws of this country and of human dignity is not reason enough to break those laws.
Just. The. Opposite.