Is there any limit to what he can say with out getting into actual legal trouble? Like as much as people like to blow up about what he's already said, he's been coy enough to only use innuendo and implied statements. But let's just say he told supporters at a rally to beat up a protester in a clear and decisive manner. "Somebody beat that guy up" or he told them to riot in the streets after a rally "I want all my great supporters to go out in the street and riot to show them we will stand up to them". He's been incrementally increasing his aggressiveness in his statements and all though he hasn't crossed any lines yet he's getting closer and closer. What would it look like if he did. Would it just be a lawsuit? Or would he get in actual trouble?

Edit: the quotes aren't actual quotes or anything, just examples of what would be clear directions to his supporters.