I'll address the comments about Liz Cheney by telling you what Harvard Professors Ziblatt and Levitsky say about how democracies die and how they are saved.
(The book is fabulous and was quite timely when it came out in 2018)
Basically, they said this (page 299):
When one of the candidates (in this case, Trump) goes off the deep end and embraces autocratic methods, what will save the nation is Republicans to switch and vote Democratic . . .
1/