On page 8, Chief Justice Roberts decides that no prosecution of the president can be premised either on a use of the pardon power or on the firing of an executive branch official (like, say, the Special Counsel investigating the president).
So, if you have a client who's facing Federal charges of any kind and can afford a couple mil to bribe the President for a pardon, we can't officially recommend you do it. Just know that the bribe recipient in this case would be totally immune from prosecution. Academically.
Does this also apply to the idea of turning all federal civil service (under the Executive) into at-will workers, retained on the basis of political loyalty?
What if Biden had Trump arrested right now as an enemy of the state and had him removed from all ballots? That would be terrible as well... but it might by you time to pack the courts and fix this. I hate that I even sorta think this is a viable option.