The subject of his sex life wouldn't be on the agenda for a national security briefing. The way people knew, and the flow of information, had to do with the way it was reported, who told who. It didn't follow protocol up the chain of command. That's more closely the job of the CIA director. The Prez relies on his staff to bring him the best evidence of what's going on in the world, dontcha think? Investigating the CIA director is necessarily small and quiet if it's done properly. I suppose Petraeus had a hand in the drone strike that killed the Libyan Al-Qaeda leader, which fomented the reprisal at Benghazi. But I doubt that the Ambassador went to the CIA asking for protection. And he seems to have been implementing his own security protocol by being in the facility that was attacked.