cleric. the evidence indicates this was the alleged criminal act of a single individual. >> just to say he's a terrorist doesn't really explain what he is. terrorism is a tactic. he used the tactic of terrorism. >> reporter: this professor is a former military lawyer and terrorism expert. he says hasan's new admission clearly shows that he's identifying himself as an enemy combatant in league with the taliban. >> what caused him to do it. he's a radical islamist extremist self-identified with the taliban. we should refer hasan as a jihadist. >> if you're saying you're defending the taliban that defines you as an enemy combatant. if hasan sees himself as a jihadist can he use that as a defense given the government isn't calling this an act of terror? >> the judge gave him until monday to prove to her that it's a valid defense, erin and