"We could never verify that there was any Iraqi authority, direction and control, complicity with al Qaeda for 9/11 or any operational act against America. Period."

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We have to deal with this new type of threat in a way we haven’t yet defined. . . . With a low-probability, high-impact event like this . . . If there’s a one percent chance that Pakistani scientists are helping al Qaeda build or develop a nuclear weapon, we have to treat it as a certainty in terms of our response.

— Dick Cheney