Nope
Believed in WMDs they hyped? Perhaps. Believed in the threat they hyped? Nope.
They didn’t believe in the WMD’s they hyped either and we know this for a fact. Gene Lyons pointed out the obvious at the time:
The administration’s strategy of loudly proclaiming that Iraq poses a dire threat to U.S. security while making a public spectacle of massing troops along its border as if it were scarcely capable of self-defense makes no sense.
Clearly, they didn’t really believe that Saddam had any WMD capability. The governments of the US and Britain would have leveled Iraq before they put over a hundred thousand soldiers out in the open on the Kuwait border if they had. They knew.
.