Until last week, the Obama administration's official position was that it had never technically acknowledged the existence of a memo from the Office of Legal Counsel laying out the legal framework for the targeted killing of an American citizen.
"The very fact of the existence or nonexistence of such documents is itself classified," the Justice Department wrote in a previous letter, despite wide discussion from members of the administration on the general principles of the targeted killing program.
Source: Huffington Post. Read full article. (link)