He also questioned why an independent Accountability Review Board that investigated the attacks didn't expand its probe to cover decisions made higher up the chain of command.
He also asked why a State Department review board that investigated the attacks didn't expand its probe to cover decisions made higher up the chain of command.
Another doubted Diamond would become embroiled in the Serious Fraud Office's recently launched Libor probe, even if sources at Barclays confirmed to CNN they are bound by Diamond's contract to cover his legal costs, should he face any.