You know, the Covid emergency is as likely as anything else. Hopefully everything‘s OK in this guy’s personal life. Being that he was appointed by Trump, I don’t think there’s reason to believe something nefarious by Trump is forcing him to leave. I know that’s not as sexy, but sometimes life is like that.
Because if you’re going to refuse such a request on principle, you also stick around to make them fire you instead of resigning to let someone else do the dirty work. You don’t just resign without explaining why.
If he contracted covid he would let that be known, if only to prevent these kinds of questions being asked. There’s no shame in contracting covid19, especially if you’re a republican.
His way of weaseling out of the ethical obligation and legal responsibility to charge Rump for a number of crimes based on that one call alone. (My take on it, not based on anything I’ve read . . . yet.)