Apparently during the oral arguments over the legality of the detention of Hamdi, the American citizen who was captured in Afghanistan and who has been held without charges since, one of the judges asked where the limit was for declaring people "enemy combatants". He asked, for example, could someone [a citizen] stopped in an airport be declared an enemy combatant? The government's lawyer said yes.
UPDATE: NYT article on this is here, though I haven't yet read it.
