McCain: CIA secrecy story just beginning

(CNN) - Sen. John McCain thinks we haven't heard the last about allegations that former Vice President Dick Cheney ordered secrecy for a CIA surveillance operation after the September 11, 2001, terror attacks.

"If I know Washington, this is the beginning of a pretty involved and detailed story," McCain said Sunday on the NBC program "Meet the Press."

According to a New York Times report, Cheney ordered the CIA to withhold information about the unspecified program from Congress. CIA Director Leon Panetta told the House Intelligence Committee last month about the program, which he said had been shut down.

McCain said he knew little about the program and offered no details. He said he expected Cheney, who has yet to comment on the story, to speak up.