For one thing, it makes it very hard to consider Colin Powell an honorable man.
Dec., 2001 State Department's INR gives Powell a report saying (in words of Greg Thielmann), "there is no persuasive evidence that the Iraqi nuclear program is being reconstituted."
Jan. 30, 2002 "[T]he CIA published an unclassified report to Congress that stated, 'Baghdad may be attempting to acquire materials that could aid in reconstituting its nuclear-weapons program.' A week later, Colin Powell told the House International Relations Committee, 'With respect to the nuclear program, there is no doubt that the Iraqis are pursuing it.'
Oh my, he changed "no persuasive evidence" to "no doubt". That is almost perjury.