While Bush's position (it's actually US policy -- any president would agree with him, Democrat or Republican) might seem hypocritical on the surface (no pun intended, Surfacing), the United States is committed to stopping the proliferation of nuclear weapons. We are scaling back on how many we have (although it's still a ridiculously large amount), and working closely with Russia/former Soviet Union. However, given that the Soviet Union -- which has tons and tons of nukes -- was our archenemy as recently as 1989, we weren't about to just get rid of all of them.
Another important objective is keeping nukes and biochemical weapons out of the hands of nutjobs like Saddam. I think it's fair to say that the US is committed to
not using nukes, but Saddam would probably use one as soon as he got the last bolt screwed into place. I think there is little doubt that if the Taliban had had nukes, their boy bin Laden wouldn't have bothered with flying some puny jumbo jets into a few buildings. We need to work on fewer countries having them, not more, and maybe someday (*gazes into the distance daydreaming wistfully about true world peace and sister/brotherhood*) we can get rid of all of ours too.
