George Bush has gone on record as saying that Saddam Hussein had no involvement in the WTC attacks of September 2001. This clarifies his previous somewhat confused message on the subject. A recent opinion poll showed that 70% oF Americans thought that Hussein was personally involved in the attacks (and therefore, by implication, that this was one of the major reasons behind the war on Iraq).
Bush still maintains that there are links between Hussein and Al-Quaida, but there seems to be only shaky evidence to support this.