Bruce Ackerman and Oona Hathaway wrote today in
The Iraq War Is Now Illegal
Ongoing combat in Iraq is illegal under US law. As of January 1, Congress’ authorization of the war expired.
As some of the comments to the article point out, this occupation of Iraq war was never legal.
I haven’t updated it for almost a year, but if you are interested, check out:
My response to 9/11/01 and then to the invasion of Iraq
with links to articles and resources