The NY Slimes ran with the story in 2014, detailing the injuries to US servicemen who chanced across Saddam's caches of mustard agent and sarin. The Slimes later published the US intelligence report on the events, released under FOIA. It's even been noted on Wikipedia that "... the total number of munitions discovered since 2003 had climbed to 4,990 ...."
The Daily Beast later reported that Bush administration insiders claimed that it was Carl Rove's idea to cover up having found the weapons.
Apparently they were willing to take the hit politically because they saw that as a better option than instigating the largest Islamo-Fascists scavenger hunt in history because the news, if published, would attract terrorist types from all over the planet who lusted after chemical or biological weapons.
And BTW, WMD is a disinformation term coined by the Soviets Pre-WWII. The non-prejudicial and correct military terminology is either "unconventional" or NBC (nuclear, biological, chemical) weapons.
Yes, he most certainly did.