John Yoo is an interesting guy, much reviled by some. He was responsible for developing arguments supporting further expansions of presidential power, the unitary executive it is called. He was also responsible for the memos justifying the use of torture, though it's use has been rejected by previous presidents--notably Washington.
The blogs have been on him recently for the logic he has used in further justifying torture. Here's Slate's; here's Balkinization's.
His premise is that war powers imply the power to kill, a greater power which includes within it all lesser powers, including the power to torture, which though it may make you wish you were dead, doesn't kill you.
The above writers take him on. We'll review in class.