This was his plan the entire time! Become President - this gives you absolute immunity for the 4 years in office, plus the year or so campaigning, plus a year or so after (“we can’t prosecute him - it will look like it’s political revenge!”). Do something so stupid that you’re voted out of office (could Trump have actually been working with the Chinese to develop COVID? Just askin’ here…), then announce your candidacy again (can’t indict - looks like a political hit), win again! You’ve just given yourself at least 14 years worth of immunity!
I guess he really is playing 5-dimentional chess!