Maybe these things are entirely unrelated. The details of the SEC's concerns are not yet entirely clear. Having publicly criticized the president shouldn't make a person immune to law enforcement scrutiny. But even so, I wouldn't be surprised if, rightly or wrongly, some people draw the conclusion that if they don't want to make themselves a target for regulatory scrutiny, they should make their public political profile minimal to invisible. Or at least make it supportive of the president rather than critical of him.
SEC and Leon Cooperman