This is almost unbelievable. It would seem to mean that Petraeus is willing to let himself and his people be thrown under the bus. Issa has to pursue this, from Petraeus on down, until someone who won't allow themselves to be sacrificed to save this foul administration is found.
I should add that I am shaken: I honestly thought much more of Petraeus than this. Maybe there is something more to his statements and motives than trying to save some political skins, but what could it be?