This seems like the play.
Generally it's resignation that is offered to POTUS. Especially given these circumstances, it would be a major breach of decorum (and be optically opposite to what's thought to be intended by RR) to simply quit. To serve at the pleasure of the President dictates POTUS may accept or reject his offer to resign.
Why would POTUS fire and pass up an opportunity to troll MSM if he knows FISA will bring down the house?
Irrelevant