The aiding and abbetting those who would attack us.
There is no negotiating with a whacko like Hussein.
What's there to negotiate? My only claim is that a wiser course of action would be to put Saddam on notice that if he tries anything against us he's history. Otherwise we let him alone. Saddam is not a wacko. He would not have survived in power this long if he were. He's a cold, brutal, calculating dictator, but certainly not an irrational one. He knows that if we wanted to we could topple him before you can say Baghdad.
Sit back and wait to be struck with weapons of mass destruction by a WHACKO. "Wise" is not the four-letter word I would use to describe your chosen COA.