Evidently the DOJ railroaded Flynn and got him to plead guilty through coercion by threatening to prosecute Flynn's son.
Then Flynn, under penalty of perjury, made statements admitting his guilt. Sullivan could consider contempt of court or refer him to DOJ for perjury charges. The latter won't work but the former might.
The real question might be "what will Sullivan do about the DOJ misconduct?" The appeals court might order a new trial for Flynn, followed almost instantly by the DOJ dismissing charges before a different judge.
I understand how Flynn got there.
So if a person pleads guilty because of a gun held to his head, literally or figuratively, and then he is later found to be innocent of the charges, he can be prosecuted for perjury because he pled guilty initially?