To my recollection there was no connection between Iraq and 9/11. There were few if any WMDs in Iraq assuming we are talking about chemical and biologicals. Their A progrom was taken out by Israel long ago. If we were looking for countries with real WMD stockpiles, there were others if that is what we wished to do starting with Russia, N Korea, China, and if we wanted to go after friendlies there is Britain, France both with A programs, Israel etc. No one has adequately pointed out to me the rationale for this invasion except some comment the intelligence was wrong. Wrong, it was, it was a disaster for our credibility. It was not just wrong about the WMDs, let’s not forget according to the intell, they were going to be awaiting for us with welcome arms, the people that is. The real question is, did that administration get anything right about Iraq?
Someone on Bush’s staff, his Treasury Secretary I think, said that the first order of business in 2001 after Bush’s election was invading Iraq and getting Saddam - Bush’s staff was to find a usable rationale. Bush had already decided to do it for his pwn reasons apparently - I suspect it had something to do with Saddam reported trying to take his dad out when Bush Sr. visited Kuwait years before.
The second Iraq war was a continuation of Desert Storm