I'd like to address this point again... If you are lied to, make a decision that turns out to be wrong, are you still responsible?
Is there a suggestion that he got lied to?
What is the basis for that contention -- if it is being argued?
I realize that -- in the end -- we failed to find much in the way of the WMDs we expected to find. But the absence of evidence does not entail the evidence of absence or of lies. It wasn't just the Bush Administration advisors who thought they "knew" that WMDs were there. The ******* guy, Saddam, after all, had actually USED WMDs.
The Clinton Administration also "knew" without doubt that Saddam "had" WMDs.
If that mistaken belief (if it was a mistake) turned out to be mistaken, that does NOT translate in logic or fairness into the proposition that anybody "lied" to President Bush.
(I see no evidence that President Bush got lied to. But, to address your question
as asked, IF somebody lied to him, obviously that would distort his ability to reach a valid conclusion and might have changed his decision. The blame would then appropriately fall upon those who lied to him.)