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My perception of trump is that he stays within legal boundaries, but has no ethics in how he conducts himself personally\professionally.
I doubt that trump will ever be directly connected with criminal activities, but its likely that many people closest to him, and those who he had business relationships, have shady backgrounds.
Example. If his tax returns are ever released\leaked. My prediction is that his taxes pass legal audits, but there will be shit load of business transactions with shady people\businesses and exploitation of tax loop holes. trump has a carpetbagger mentality, and if he could, he would be selling water in puerto rico at a price high than gold. Not illegal, but clearly unethical. It is that kind if crap that had made him a rich man at the expense of others, I think his tax return would expose it.
Mueller can't charge trump with crimes for being an unethical human being who preys on those who are victims of circumstances they can't control (storms, laid off, born a minority, dreamers, etc), and I doubt that Mueller can even make a statement that suggests trump is innocent of legal crimes, but a very unethical person who has made a career of fucking over people. Mueller simply has to stick to facts, even if the facts suggest trump has no ethics\morality.