He can keep the license and firearm. I think he avoids Trump at all opportunities. Jace, you don't think the Secret Service has a file on Deniro? If they feel he is a major threat, they would take steps in legally having his firearm(s) and license taken away.

"I have this Nightmare. I'm on 5th avenue watching the St. Patrick's Day parade and I have a coronary and nine thousand cops march happily over my body." Chief Sidney Green