If someone had the imagination to write a sci-fi novel about Fox news and the rise of Trump, they would have.
You kidding, right? Those stories have been dime a dozen since the late 90s at least.
24 warned us about having an evil, terrorist US president. As have done a few movies in the past. Streaming platforms were pretty much masturbating themselves over “Confederate US AU” script offerings as early as 2014. Not to mention the nowadays trite trodden trope of “Nazi US AU”.
Heck, you don’t even need fiction. Chile’s cup in 1973 was paid for by the CIA as a social experiment to produce the rising and establishment of a dictatorship.