Rod Rosenstein Could Win Immunity from Prosecution by Resigning to Cooperate with Investigators on ObamaGate

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Unless the Democrats somehow can disprove that Rod Rosenstein signed FISA warrant requests knowingly based on bogus intelligence (the Golden Shower Dossier) provided by Team Hillary from Fusion GPS, so Rosenstein is criminally liable it would seem, then couldn’t an offer be made to him that he can resign to avoid prosecution and cooperate with investigators into the ObamaGate conspiracy?