The problem is, finding a crime is not all that hard, when that is all you are set on doing. Trump has a massive corp. Lots of people working for him. He trust that they are doing things correctly. When you have a vigilant DA set on finding anything, you likely will. Even a minor slap on the wrist crime, which will be prosecuted at the fullest extent of the law, with additional penalties to boot.
Think Al Capone. His crime was a simple tax law. Usually a slap on the wrist and a fine. They intend to do worse to Trump.
I remember a comparison Rush Limbaugh made early on in President Trump's term regarding how the democrat party was going to hound him for any minor flaw.
Rush said it is like driving from California to New York with a state trooper following you every mile of the trip looking for any reason to pull you over. Even the most safety conscious minded driver will make minor unintentional infractions during the long trip and will cause the trooper to react by issuing a violation.
The democrat party (and some rinos) have made it their mission in life to punish Donald Trump for the audacity to run for POTUS as a political outsider, defeat the assumed heir queen apparent to obama, and put America and the American people first. They will do everything possible to make sure he regrets ever coming down the escalator in 2015.