The only thing Mueller might have on him is potentially a process crime. Just like Flynn and Manafort and Papadoupolas (however the fuck you spell his name). Mueller's entire career has been built on bringing process crimes against innocent people. A process crime, ultimately, amounts to someone not repeating dates and times verbatim over the course of several interviews. He can bankrupt anyone he so desires. And that's exactly what he is doing. He's done it for his entire fucking career all the while ignoring real crimes. I'd love to see Frankenstein hang.