As former legal counsel to Vice President Dick Cheney, David Addington apparently took the lead on refusing the 9/11 Commission’s request to review interrogation tapes or access to detainees. It appears Addington got the draft of the letter from 9/11 Commission–which was addressed to Secretary of Defense Donald Rumsfeld and Director of Central Intelligence George Tenet. Tenet and Addington clearly had a conversation about how to respond. But it seems that Addington drafted the response, got Condoleeza Rice, Andy Card, and Alberto Gonzales to review it, and then sent it to Tenet (and, presumably, Rumsfeld) to okay and sign the letter.

Why would Addington have obstructed the 9/11 Commission’s review?