My bet is it was Andrew Fitch, as it was just announced yesterday, “DAAG of Anti-Trust Dep’t to resign” but “matter not public yet”:
https://biglawbusiness.com/top-deputy-at-doj-antitrust-division-said-to-depart
Also Roger Alford, a deputy attorney general for international affairs, resigned a few weeks ago, but the timing of Fitch is too coincidental.
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Then there's yesterday's article about Kathy O'Neill's appointment to AntiTrust division.
It tells us a lot about the arrogance of swamp dwellers and how insidious their contempt for “we the people” is when they are in high level jobs yet feel they can watch porn on their work computer and then lie about it.
Well the right outcome occurred: he no longer works for “us”.