Who issued the license? The issuer is the one in charge of it and they can and obviously will revoke said license at thier discretion. The Government cannot legally take what is not thiers.
From a legal standpoint, are they able to do this? As I said before, what he said was stupid, but if they are doing this without the authority, then the guy deserves support, or else it can happen to any of us. And btw I thought he was a loud mouth long before he did this, but even loud mouths deserve due process.