So, it was more spying on Americans?

Per a Tumulty/Time link provided by Libby, a speculation that the "so secret" program was more about spying on Americans than assassinations.

But two former ranking CIA officials have told TIME that there's another equally plausible possibility: The program could have required the Agency to spy on Americans. Domestic surveillance is outside the CIA's purview -– it's usually the FBI's job – and it's easy to see why Cheney would have wanted to keep it from Congress.

Both officials say they were never told what was in the program, and that they're only making calculated guesses. But their theory gibes with other reports, quoting ex-CIA officials, that say the program had to do with intelligence collection, not assassinations.

Just another guess to fill in the post below.