I’d mention to them that the pile was well known to all since 1991. All the coalition could do was get the Russians to dilute it and then hope that Saddam didn’t get centrifuges. Just looking at the UN weapons reports of what he had vs what he destroyed are telling, and that was all before Bush. We can’t expect liberals to be responsive to logic, but it may stun them for a second.
There is not logically way to talk to the liberals that I know, they are all blinded by hatred towards Bush and Republicans in general. If there was ever a more damning sign that evil is among us, it would be the fanning of the flames of hatred by the left.