Here is a very nice factcheck from the WaPo that I haven't seen repeated elsewhere and that I would like to see spread. They call it, with typical delicacy, "skating close to the line". I would call it more like a lie.
Bush was skating close to the line when he said that he spoke to generals in the White House, asked if they had enough troops, and "they looked me in the eye and said, 'Yes, sir, Mr. President.'" In that 2002 White House meeting, Gen. Tommy R. Franks, whom Bush mentioned, said there were enough troops, but Shinseki told the president there were not. Other senior members of the Joint Chiefs of Staff told Defense Secretary Donald H. Rumsfeld that they were concerned about troop levels.
Wash. Post. 10/9
Updated:
WaPo Fact Check Link.