What is meant by “caught”? Usually that means some sort off wrongdoing and subsequent punishment. No one, including Trump, appears willing to deal with Soros and son.
It may be left to we the people. Start off by ingraining the phrase “Nazi collaborator “ whenever his name comes up. Then posters can appear as “Wanted for crimes against humanity”. Finally, demand an arrest, by LEO or citizens’ arrest.
If a good arguable case may be made that George Soros is indeed consorting with the enemy, lending substantial assistance and even guidance in how to best subvert US interests, then this is quite definitely sedition and highly traitorous.
We have laws against that in this country. Enforce them.