So what? Lying about building weapons doesn't appear in the criteria for a just war.
"Saddam sends money to terrorists for bombings in Israel"
Well, that might be a legitimate reason for Israel to attack Iraq, but not the USA.
"Saddam is trying to go nuclear and he does have a past"
There are plenty of nations trying to go nuclear. That, in and of itself, is not a criteria for a just war. If he has violated agreements with the UN as per non-proliferation, then it is that body which bears responsibility for dealing with him over it. (Besides, several of our "allies" have gone nuclear as well. Pakistan and Israel, for instance. Should we attack them too?)