The main issue is not whether the UN had authority to attack Iraq, but whether it ever delegated this authority to the US. The UN can choose to authorize another party to use force, as it did in the Korean War--or it can choose not to authorize another party to do so.

It is the burden of Teribus, BB, pdq, et al. to give the exact quote whereby the UN authorized the US to attack Iraq in March 2003.

So far, despite their mighty labors--and very impressive pillaging of the local lake stocked with red herring it is-- they have brought forth precisely--zero--quotes doing this.

I suppose the middle initial of all 3--Teribus, pdq, and BB --is S. For Sisyphus.

But we're still waiting patiently for the above-cited quote.

Good luck.