2003 State of the Union Address
Our intelligence officials estimate that Saddam Hussein had the materials to produce as much as 500 tons of sarin, mustard and VX nerve agent. In such quantities, these chemical agents could also kill untold thousands. He's not accounted for these materials. He has given no evidence that he has destroyed them. U.S. intelligence indicates that Saddam Hussein had upwards of 30,000 munitions capable of delivering chemical agents. Inspectors recently turned up 16 of them, despite Iraq's recent declaration denying their existence. Saddam Hussein has not accounted for the remaining 29,984 of these prohibited munitions. He has given no evidence that he has destroyed them. Maybe the janitor, or whoever that "Pentagon official" was, should have read the 2003 SOTU before saying those weren't the WMD we went to war for. They were cited as reasons Saddam was a liar and a dangerous one.
This is an excellent point.
Whether they were before or after 1991 is not the point. The point was Saddam was to have destroyed all of his WMDs. This evidence shows he did not and the ones found were still dangerous.