Key passage from today's NSA article in the Post (emphasis added) ...

The NSA activities were justified by a classified Justice Department legal opinion authored by John C. Yoo, a former deputy in the Office of Legal Counsel who argued that congressional approval of the war on al Qaeda gave broad authority to the president, according to the Times.

That legal argument was similar to another 2002 memo authored primarily by Yoo, which outlined an extremely narrow definition of torture. That opinion, which was signed by another Justice official, was formally disavowed after it was disclosed by the Washington Post.

Another John Yoo special.