It wouldn't matter anyway, because it seems one of the tenets of this particular government is:

Sure, there's a law. Try and enforce it.

Unless I'm mistaken, all the agencies with the power to arrest a member of the Executive branch, lie within the Executive branch itself and they are all controlled, or soon will be controlled, by persons appointed by the President. All of these persons are expected to be more faithful to the current President than to the Constitution.

Which means: even if Congress wanted to stop him, there's nothing that it can do to enforce that.

Supreme Court Marshalls can enforce the courts order (and arrest) and answer to the court rather than the executive/ DOJ. Only federal police I can think of outside the executive branch that would have the power to do it.

The Judicial branch has US Probation and Pretrial as an armed internal branch with legal powers.

Thanks, that's a good point.

I wonder what is the process for that finding. Is a court involved?

It should not be unilateral decision by state department.

> I wonder what is the process for that finding. Is a court involved?

My understanding is that the State Department can revoke a visa without any court involvement. There's a waiver process, but that process also entirely sidesteps the courts.

> It should not be unilateral decision by state department.

I agree completely.