Combination of bribe and threat. Petraeus has to play ball or the Regime cuts off his already PO’d wife, they face financial ruin and she definitely dumps him. He keeps his mouth shut on the witness stand and maybe Holly will let him grovel back into the doghouse.
Goes with the saying or warning : What the government gives the government can take away.
Good grief, Gen P would be far better off if he had dumped her long ago.