That's where it's a fun crisis. His VP was the sewer socialist mayor of Milwaukee and would have made a great president, but that'd mean they let a proper socialist hold the office. If they ratfuck him to install someone further down the line of succession it's a precedent and a massive radicalising point which shows how farcical bourgeois democracy is. If they release him from prison he's a king, if they don't he's a martyr. All the options hurt the system. Reactionaries have that same set of conditions set up for them with Trump.

Breaking news: The entire US population has perished in a freak accident experts are calling, "probably the best outcome for the world, to be entirely honest with you."

There is one scenario in which the office of the presidency stays vacant.