Everything you want to know about Martial Law, right 'ere!
Responding to the OP:
It is possible the president could say, “Heysa, America, we’re under attack, so, uh, until I say otherwise, you can call me King Bush, m’kay? Or rather, how about The Stupenderflous Royal King Bush.” In a time of emergency, few would resist the steps needed for their safety. After the suicide plane dives, most Americans were ready to establish ID card systems and do whatever it took to make things safe. Cynics were ignored, or harrassed. Thankfully the hysteria wore off and things returned to our bickering normal, but if a nuclear attack occured…
The strength of the military under martial law is bolstered by the support it gets. When martial law was declared in California around the time of Rodney King, of course no one wanted them around(Although at that time things were reverting to normal again). But if a major city is suddenly levelled by a nuke, the military will ride into the cities cheered on by flag-waving gun-toting patriotic nationalists, or some such.
If we’re looking at country-wide(as opposed to just major cities) martial law, things get tricky. The Supreme Court could tell Bush, “Hey, what you’re doing is not essential to the security of our country, so knock it off.” But Bush is the one with the army- Under martial law, the Supreme Court and Legislative have no authority. It comes down to two choices now:
a. President Bush decides to accept the blast of negatism he’ll eventually get after relinquishing power and withdraws troops, or
b. Bush wipes out every liberal in the Western Hemisphere.
If it’s B, well, then, our marvelous experiment in democracy has reached an end. So be it. I think a good follow-up question is: How would foreign countries(espec. UK, France, Russia) react to choice B?