The WMDs that Cheney, Condoleeza Rice, Donald Rumsfield, and Colin Powell were referring to were nuclear weapons [1] though, not chemical weapons. We already knew he had chemical weapons:
>President Bush, Vice President Cheney, Condoleezza Rice, Donald Rumsfeld,
Colin Powell and George Tenet, to name a few leading figures, built support for the
war by telling the world that Saddam Hussein was stockpiling chemical weapons,
feverishly developing germ warfare devices and racing to build a nuclear bomb.
Some of them, notably Mr. Cheney, the administration's doomsayer in chief, said
Iraq had conspired with Al Qaeda that Saddam Hussein was connected to 9/11.
1: http://www.nytimes.com/2005/11/02/opinion/remember-that-mush...