Remember, as long as a person BELEIVED that there was a lawful order, no mater which TinkerBelle they beleived in at the time, such is a sufficiency of validation that a lawful order could have been legal at the time.... Because the Oath is:
"I do solemnly swear that I will faithfully execute the office of President of the United States, and will to the best of my Ability, preserve, protect and defend the Memos of John Yoo."See, it's all fair and good!
( op cit glenn's update )