"Messing with the wrong people"?
The only people Trump is messing with are liberals. For the most part, Republicans have gone through their five stages of grief and have accepted that he has won the nomination. So, if he's only messing with liberals and he is being threatened with death (which would not surprise me, given the fact that they are liberals), then DUmmie is explicitly stating that liberals are likely to resort to political violence. Political violence is also known as terrorism and insurrection.