Palingenetic ultranationalism is a theory concerning generic fascism formulated by British political theorist Roger Griffin. The key element of this theory is the belief that fascism can be defined by its core myth, namely that of revolution in order to achieve a "national rebirth"—palingenesis. Griffin argues that the unique synthesis of palingenesis and ultranationalism differentiates fascism from para-fascism and other authoritarian nationalist ideologies.

TL;DR: "Make America Great Again." And while Trump might just say it because it makes the chuds cheer him on, the people cheering actually believe it. And no, they don't need to be some fanatic ready to kill and die for the cause to be fascists -- they just need to support a few people who are like that and then "I'm just doing my job" the rest of the way.

the people that want gas chambers

They already uncritically support every genocidal war we've fought or are fighting, they already support the concentration camps we're running, they already support the domestic police state we've built, and they're already been primed (via white supremacy) to view all sorts of people as subhuman -- what makes you so sure they'd balk at gas chambers?