Just today I read this article about a movement to defend American conservatism from that kind of populism. Reading this, I think maybe it's of interest to you: https://www.vox.com/2019/1/18/18175582/trump-fox-news-conservative-media-charlie-sykes
I myself really wish the Republican party found another issue to define itself around, instead of immigration or LGBTQ+ rights. (Full disclosure, I'm trans and an immigrant to Canada).