They had a prompt military tribunal once SCOTUS spoke on the matter. Bush proposes that he has the power to hold a citizen enemy combatant indefinitely without a tribunal. Significant difference.
Per the Geneva Convention, POW's may be held as long as hostilities continue. Enemy combatants, on the other hand, may be given *any* punishment whatsoever, up to and including being shot on sight, without any trial of any form.
Thus, both POW's and enemy combatants can be held without trial and without charges and without access to attorneys.