I don't think a preemptive strike is a legitimate option at this point. However, Bush needs to make it explicitly clear that any attack on the US that utilizes WMDs (and nuclear=chemical=biological AFAWC) will be responded to 100-fold (IOW "We will go ape-sh!t"). Of course that has always been understood but given the caliber of individuals we are dealing with I think it bears repeating in no uncertain terms. It should be emphasized that the rules change entirely after anyone deploys WMDs...absolute proof that a country sponsors terrorism would no longer be required and candidate nations would be annihilated "just to be on the safe side". Of course let's hope it doesn't come to that, but the threat of a catastrophic retaliatory strike is probably the only effective defense (if any) that America has right now.