Sullivans better course of action would be to immediately grant the governments motion to dismiss in a short order that framed his earlier rulings and his appointment of an amicus as a concern for transparency. Then, by feigning disgust over the brief Gleeson submitted, Sullivan could extricate himself from the swamp he created.
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THEN he could resign and spend the rest of his worthless life cleaning toilets and apologizing for being one of the world’s biggest assholes.
A clean way out of this for Sullivan is to first grant the motion to withdraw the guilty plea, (Flynn’s pending motion from Jan. or Feb IIRC), then let the DOJ renew their motion to dismiss, (case is now active for litigation/trial). This then makes the DOJ have to re-affirm that they do not have a viable case.