I agree with the Senator. Those "Americans" involved in this treason should be refused entry back into the U.S. until they are thoroughly investigated for what crimes they may have committed in aiding and giving comfort to our enemy. Then they should be given two choices - permanent denial of entry back into the U.S. or allow them to enter back into the U.S. to stand trial and be incarcerated for their crime.
This goes double for Ramsey Clark.