https://en.wikipedia.org/wiki/Iraq_Liberation_Act
And the https://en.wikipedia.org/wiki/Bombing_of_Iraq_(1998) ?
"The Iraq Liberation Act of 1998 is a United States Congressional statement of policy stating that "It should be the policy of the United States to support efforts to remove the regime headed by Saddam Hussein from power in Iraq..."[1][2] It was signed into law by President Bill Clinton, .... "
To talk big and not do anything emboldens the target.
The Iraq war was used to bolster voters for the next year's election - the US had been punching ghosts and getting nowhere in Afghanistan after 9/11, so they switched targets to one that looked similarly foreign and, more importantly, couldn't hide.
Then, of course, the US ignored them because "he's going to hide the evidence", invaded for its own reasons... and famously found nothing. Blix was painted as an incompetent by the US, but even after stomping Iraq into dust and having full control of the country, the US found nothing.
He chose (1).