When Mueller brought folks on board his staff who are experts on money laundering that really scared the pants off of Trump. That’s where the real crime rests. This is at the heart of the Trump Russian connection. But it’s a tough nut to crack and thus it may take more that just a few years to bring charges against the president.
It is one of those things of which insiders are fully aware, but until the proof has been fully amassed they have got to keep quite about it, including the mainstream news media.