

You really don’t know how researches work… they get to be in multiple projects globally, specially when working in a university… that is why of the name. Besides, the US is highly sensitive with confidential information and for the most ridiculous things you need a “security clearance” that he will never get even the most basic one. Today, most on the spying is not done presentially within the target country, let alone with such a prominent position.
No much. He would have to declare if conflict of interest or to IRS. But strong feeling that is not the case. Again, if evidence was there, the FBI and even Trump would be all over with the evidence. This guy, probably had no even Confidential Security Clearance (lowest one). The only thing I can think of is industrial espionage but those are brought by the injured party and goes to a normal judicial channel… nothing indicates that is the case here.