John Yoo is a disgrace to this nation for his actions in promoting torture in the Bush Administration. This answer in a Q&A session tells you all you need to know about his man.

Matt Yglesias:

I’m just going to quote Orrin Kerr on this: John Yoo: “Now that I’m not in the government, part of my role, because I have a certain amount of expertise, is to try to keep the government honest.” – From an interview with the Orange County Register. On the other hand, back when he was in government…. That’s funny. But it’s also outrageous. It’s not as if Yoo’s job in government was as a press flask. The Office of Legal Counsel really is there to try to keep the government honest.

David Addington and Dick Cheney were instrumental in using sycophants like John Yoo who willingly absconded their integrity and duties to push through Bush's torture agenda.