[plain talk]

At first glance it would appear they are calculating that Biden will become President and are distancing themselves from Trump.

[Zhang Fei]

[At first glance it would appear they are calculating that Biden will become President and are distancing themselves from Trump.]

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As political appointees, if Trump is out, they’ll need to find new jobs. It’s possible that they did get job offers, and decided to announce their resignations all at once because they’re not really Trump fans.