This article in Foreign Affairs begins:

President George W. Bush has singled out terrorist nuclear attacks on the United States as the defining threat the nation will face in the foreseeable future. In addressing this specter, he has asserted that Americans’ "highest priority is to keep terrorists from acquiring weapons of mass destruction." So far, however, his words have not been matched by deeds. The Bush administration has yet to develop a coherent strategy for combating the threat of nuclear terror.

The article sets forth "a new doctrine of ‘Three No’s’: no loose nukes, no new nascent nukes, and no new nuclear states", all of which the Bush administration’s efforts are (according to its author) far from what they could be. Despite the opening paragraphs, it’s not a slam-Bush piece, and I don’t present it as such. Just something to mull over, and perhaps lose sleep over.