In the UK we have a law against inciting people to violence (now under the Serious Crimes Act called Encouraging someone to commit a crime but that is less descriptive in this situation).
Given when I've see of some of Trump's speeches and the violence that has followed from them I think he'd probably be completely on the hook for incitement to violence offences and I just can't imagine any mainstream UK politician speaking that way. *
Former leaders of our previous far -right party (The BNP) were arrested and investigated for inciting racial hatred on a number of occasions).
Is there an equivalent law in the US or is it protected as free speech?
*Which isn't to say this is some protesting utopia - thanks to a previous Gov our anti-terror laws would probably be used by the police to break up legit demonstrations anyway (Thanks Tony Blair!)