It's possible. Econo-Girl has chatted about the possibility before. While Admadinejad is a loudmouth who rarely backs up his words, he better watch it this time. The U.S. may just pick up the fight.
Admadinejad distracts Iranians from internal problems by beating the anti-Zionist drum. He is betting that Bush does not have the political backing to start warring with Iran.
But that's the thing with Bush: he doesn't always do the expected thing. He certainly doesn't listen to all points of view. Doubtless his advisers will tune carefully to Bush's signals to find out what he really wants to hear and then reflect it back to him..
So Ahmadinejad better think again before taunting the tiger. It's a little irrational and in need of restoring its reputation.