Former Congressman Ron Paul discusses his argument with Rudy Giuliani during the 2007 Republican presidential debates about the link between US foreign policy and 9/11 (Rudy denied there was such a thing). Paul was the only one of 10 candidates on stage who opposed the Iraq War, and he stuck to his principles even after the crowd’s thunderous approval of Giuliani’s patriotism-laden rebuke. Paul’s debate answer has stood the test of time, and helped popularize the idea that an interventionist foreign policy causes violent blowback.

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