This NYT OpEd by an Italian (immigrant?) gives some advice employing a technique that was used in Italy to oppose Silvio Berlusconi.
We need to find an effective way to stop Trump, and past tactics have been proven totally ineffective against GWB and BO, both of whom were/are Wall Street shills and war hawks. We need to get real. Focusing on future elections, petitioning, writing OpEds, protest marches, demonstrations...all these are ineffective. Remember Rove’s statement, “We’re an empire now, and when we act, we create our own reality. And while you’re studying that reality — judiciously, as you will — we’ll act again, creating other new realities, which you can study too, and that’s how things will sort out. We’re history’s actors . . . and you, all of you, will be left to just study what we do.”