This is a deeply worrying, must-read article from the New Yorker. It considers that if Trump came to power, there is a decent chance that the American experiment would be over.
Democracies everywhere are worried about the rise of right wing populism. For example, in the UK we see the Boris Johnson/Nigel Farage axis playing to xenophobia and quaint ideas of sovereignty and nationalism.
From rightwing populism expect anger, hostility, and violence from the most vocal supporters. Freedom and democracy will suffer. Minorities should be seriously worried.