If and when it happens, the borders will be sealed and the gnashing of teeth will start about "when did you know it and why wasn't anything done to protect us..."?
And of course, that would be an excellent question.
Poltical correctness will defeat the USA.
If LA or NY goes up in a ball of fire I don't think a "disaster" for Bush or the GOP is really all that important. Bush will do what he has to do then. The world will be on fire.