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In page Political positions of the Republican Party (United States):

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The doctrine of preemptive war, wars to disarm and destroy potential military foes based on speculation of future attacks rather than in defense against actual attack, has been advocated by prominent members of the Bush administration, but the war within Iraq has undercut the influence of this doctrine within the Republican Party. Rudy Giuliani, mayor of New York at the time of the September 11 terrorist attacks, and a candidate for the Republican presidential nomination in 2008, has stated his support for that policy, saying America must keep itself "on the offensive" against terrorists.[citation needed]