The former Port Authority official and former Chris Christie ally now says he has proof the Governor knew about "Bridgegate" long before he let on. It's likely here the motive is revenge. So, is he bluffing? I'm not sure what he'd accomplish by that. Or does he have something that could be proof but could also be open to interpretation? If he has a legitimate smoking gun, not only are his presidential ambitions over. Chris Christie could face impeachment.
Even with the allegation out there, this isn't going away for Chris Christie. Late today Christie essentially denied that there is anything out there that would contradict anything he's said about the scandal.