Stephen King - The Dead Zone (1979). King at some point said this is his best book. I don’t agree, but it’s a damn good one. Greg Stillson is also pretty damn close to Trump in many ways (“regular” people love him, as does the press), but I guess it’s just the fact that both are populists.
Recommended if you’ve not read this one. Not seen the Cronenberg-adaptation ever, might have to check it out. I’ve seen clips of Martin Sheen as Stillson comparing him to Trump, and he at least seems perfect. Christopher Walken might be too weird for me as Johnny Smith.