They are cheating, it’s obvious that they are but how do you prove it? It’s like watching a magic show,you know the ball is in the other hand but didn’t see how it was done. They won’t stop until they pay a serious price.
Trump should put up $1 million of his own money as a reward to any fraudster who wants to come forward and expose the fraud operation. I would say that he should also promise to pardon that person of any federal charges, but that would probably be considered selling a pardon, so just hang onto that and possibly pardon the person or persons later.