Remember what Truman said: "The buck stops here".
As as long as Bush is willing to let the CIA cruise along without taking any action to reform them then then he is the real screw-up. Keeping Tenant was a huge mistake. He needs to put his own man in at the CIA and clean house. Bush is very weak here and the Dems are taking him to the cleaners with help from their friends at the Agency. Bush should deal with it. He hasn't. He will pay the price.