Years later? Iraq and WMDs!!! But in the inspections prior to invading, nothing was being found. There was no evidence Iraq had any WMDs. Post invasion it was pretty clear, there were no WMDs.
I'm not going to quibble. Those who opposed the war in Congress were right to do so. The evidence for WMDs was very shaky, and it came as no surprise to many of us that the claimed evidence was bogus. However, the proof really was not admitted until after Bush left office, IIRC.
2006, the W Admin, much to the chagrin of right-wing media, admitted the intel was wrong.
Woodward's
Plan of Attack published in 2004 made it pretty clear that the W Admin knew the data was near non-existent. From my memory, there was a meeting that was to go over the evidence on WMDs in Iraq, and when the presentation was over, the big wigs were concerned with how little meat there was to the claim.