Yes, happens quite often. Gen. Flynn should withdraw his guilty plea and file a motion to dismiss.
If Flynn took the plea in order to save himself from other charges, or in exchange for charges being dropped on his son, wouldn't a dismissal put all that back in play?
Not saying that he shouldn't do it, as a dismissal would reflect so poorly on Mueller that he couldn't go back on Flynn.
Just wondering what the risk is to Flynn for going back on a deal that he was obviously willing to accept.