It's an interesting question. That is why I am starting a count up clock to see how long it will take for Donald Trump to begin holding people in prisons for their political beliefs. It only made sense to start this clock at President Trump's inauguration on January 20 of the year 2017 to make it fair on him. So far we are up to 579 days, 12 hours and some odd minutes.
With regard to his "cult", I'm not sure who is circumscribed by this description. Possibly he means Republicans in general who he claims are racists, and therefore being cult members is just a hop, skip and jump from that. I am not the member of any cults, though, even though I am a Republican. However I am not aware of being a racist, and subconscious racism is supposedly a thing, so it is possible that I am a cult member without realizing it.
Hmmmmm.... I wonder if you can have a mental disorder without realizing it.
UPDATE: (9/11/2018) Well, I decided in the spirit of Catholic fraternity I would remove the clock from the side-bar and just leave it here. In these days of turmoil I don't want to tout the asininity of fellow Catholics overly much.