They started building nukes over a decade before GW came into office, dufus! He was building the weapon in the early 90's, and then they tricked Clinton and the UN into believing they were complying, until the big lie was proven.
Okay, if that's the story you want to go with.
Here's a different one. His dad agreed to inspections, but the Bush started talking smack.
Here's the thing. Saddam gave up his nukes, and we murdered him.
Qadafi gave up his nukes, and we murdered him.
Kim kept his nukes, and guess what, he's still in power.
Seems pretty simple to me.