I think one of the crucial things here—and this is something you know more about than I do—is political rhetoric. It's vital not to allow the right to cast every issue within the overarching logic that they wish to do. And the overarching logic that they wish to do is to cast every issue within either a national or a global culture war. A crucial thing is to try to disallow them from occupying that political landscape.
The most effective interventions I've seen with the radical right are those that try to push them on precisely what they would do. But one can make the mistake of playing into the framing of the issue that they have already established, because they actually have an ideological framework, because they have a systematic rhetoric, they understand exactly the moves that are useful for them.
I'll give you one example on this that I really like. It comes from Mr. Steve Bannon. He has a wonderful line that whenever he's being interviewed, all he does is wait for the person to say “identity”, and as soon as they say it, he's got them. One has to avoid falling into that trap.