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Former Treasury Secretary Paul O'Neill said Mr Bush was looking for an excuse to oust Saddam Hussein.
As a member of the president's National Security team he said he never saw any evidence of Iraqi weapons of mass destruction.
In the 23 months I was there, I never saw anything that I would characterise as evidence of weapons of mass destruction," the former member of the president's national security team said.
"To me there is a difference between real evidence and everything else."
