If he resigns, he has to stop campaigning, right? No one would believe that he’s still campaigning for 2020 if he resigns his current term. And that cuts off the flow of funds that he’s using to keep his business afloat.
Also, if he resigns, he loses all possible value to PutinCo and the info dump they’ll do on him will make Podesta’s emails and DWS’s emails about Bernie seem like “Pat the Bunny”.
@radicalcentrist - and his business crimes are the subject of Erik Schneiderman’s investigations, too, some of which can’t be pardon by Pence (I hope)