The title that they are using for the basis of the trial on W's Military Commisions Act of 2006. It's tenuous because some of the wording isn't consistant.
Sec. 948d. Jurisdiction of military commissions
(a) Jurisdiction— A military commission under this chapter shall have jurisdiction to try any offense made punishable by this chapter or the law of war when committed by an alien unlawful enemy combatant before, on, or after September 11, 2001.
(b) Lawful Enemy Combatants— Military commissions under this chapter shall not have jurisdiction over lawful enemy combatants. Lawful enemy combatants who violate the law of war are subject to chapter 47 of this title. Courts-martial established under that chapter shall have jurisdiction to try a lawful enemy combatant for any offense made punishable under this chapter.
(c) Determination of Unlawful Enemy Combatant Status Dispositive— A finding, whether before, on, or after the date of the enactment of the Military Commissions Act of 2006, by a Combatant Status Review Tribunal or another competent tribunal established under the authority of the President or the Secretary of Defense that a person is an unlawful enemy combatant is dispositive for purposes of jurisdiction for trial by military commission under this chapter.
(d) Punishments— A military commission under this chapter may, under such limitations as the Secretary of Defense may prescribe, adjudge any punishment not forbidden by this chapter, including the penalty of death when authorized under this chapter or the law of war.
:"The term 'unlawful enemy combatant' means —
(i) a person who has engaged in hostilities or who has purposefully and materially supported hostilities against the United States or its co-belligerents who is not a lawful enemy combatant (including a person who is part of the Taliban, al-Qaida, or associated forces); or
(ii) a person who, before, on, or after the date of the enactment of the Military Commissions Act of 2006, has been determined to be an unlawful enemy combatant by a Combatant Status Review Tribunal or another competent tribunal established under the authority of the President or the Secretary of Defense."
...
"The term 'lawful enemy combatant' means a person who is —
(A) a member of the regular forces of a State party engaged in hostilities against the United States;
(B) a member of a militia, volunteer corps, or organized resistance movement belonging to a State party engaged in such hostilities, which are under responsible command, wear a fixed distinctive sign recognizable at a distance, carry their arms openly, and abide by the law of war; or
(C) a member of a regular armed force who professes allegiance to a government engaged in such hostilities, but not recognized by the United States."
There is a great deal of debate about the unlawful enemy combatant definition since in one paragraph it says it applies to "aliens" and in others it does not. I'm not saying that there isn't sticking points and that the interprutation is vague, but there is laws and procedures in place that the average American has no business knowing. Sorry you can't have it both ways. Total transperancy isn't possible and you REALLY don't want to know everything either. At the same time an open trial as you are contending puts more Americans at risk. You are opening sources and techniques up for scrutiny by people we don't want to have that information.
It appears that the "procedure" is in place, even if there might be some ambiguities.
If the competent "Commission" rules the individual an unlawful enemy combatant, he is subject to trial and then punishment, including death.
So the questions become. Was the secret group assembled according to these requirements, was a trial held - in absentia is fine as long as it is allowed in this law. And then was the sentence of the trial death?
As to the rest....actually I REALLY do want to know. However, I understand Need To Know and wouldn't want everything to be public knowledge.
However, that the procedure was followed and it timeline and a list of witnesses to the procedure would not be out of line.