Scope and nature of "presidential immunity" for starters. Sh!thead is arguing it extends for life, just as does Secret Service protection. There is NO benefit from that to the office, and the only individual to whom it is relevant is Trump.
Only Nixon attempted the kind of power corruption consolidation like Trump, and the lengths to which Trump went to make it legit indicates need for this aspect of the executive branch, its immunity and protection, to be examined and changed.
I think at heart of the matter is the sitting DoJ opinion a sitting president is immune from criminal prosecution. Trump tested that theory in spades, and it may be years before resolution. I'm not sure we have years.
I believe ADX Supermax is the best place for Trump following conviction, because he is too dangerous loose. That incarceration may be the most effective deterrent to future presidential criminal acts.