I don't see how it could be. We have been assured many times over that the Bush administration never linked Iraq to the September 11, 2001, terrorist attacks.
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Before the invasion, pretty much all the Juniorbushies did was imply that Iraq was payback for 9-11.
Had 9-11 never happened, there was NO WAY the Congress would have approved a preemptive war, and NO WAY even 30% of the people would have stood for it.