I suspect it's to be like Stormy Daniels, or the impeachments (both of them) and other lawsuits about the Emoluments Clause, or the Russiagate special prosecutor investigation, etc. etc., which is to say fodder for the rubes.

What you don't get, is that elites protect their own (no matter the party), and don't want to set an example where crimes of one outgoing party are prosecuted by the incoming.

Reagan was lucky his own party took over. George Bush had to pardon folks on the way out. Clinton...well, George W. had tons to go after him for, as did Obama for W., as did Trump for Obama.. Trump could have had Hillary locked up, but he decided to play the game on their terms, despite the IRS scandal which should have led to prison for a number of people.

This racket goes back to LBJ at the very least, and likely back to Truman.