This story has absolutely nothing to do with Saddam violating the ceasefire agreements he made in 1991. Whether we gave Hussein weapons in the 1980s is irrelevant. He agreed to get rid of all he had in 1991. Has he done that? No. Has he violated the terms in which he agreed to in 1991? Yes. Therefore we have justification to resume the war. And to top that, Bush doesn't need approval from congress either.
Yeah, that old Constitution is just a joke anyway. Right?