Illinois , president of the US Conference of Catholic Bishops wrote in a September 13 , 2002 letter to President Bush that : ``Given the precedents and risks involved , we find it difficult to justify extending the war on terrorism to Iraq , absent clear and adequate evidence of Iraqi involvement in the attacks of September 11 or of an imminent attack of a grave nature (Gregory , 2003 . Bishop Gregory (2003 ) further asked Bush whether a preemptive attack would ``succeed in thwarting serious threats...











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