SNL often opens with a skit parodying the Trump White House, with Alec Baldwin playing Donald Trump and Kate Mckinnon playing Rudolph Guiliani (or, lately, Lindsay Graham). Various other members of the company play Trump’s family or Putin or members of Trump’s inner circle. Robert De Niro played Robert Mueller a few times. Matthew Broderick recently played Mike Pompeo, without distinction. It all hasn’t been really funny for a long time.
I suspect they are trapped with Alec Baldwin because there are personal relationships involved and it would be quite a snub to suddenly produce a different actor to play Trump even though Baldwin is a vulgar impersonator, all fat lips and sneer, and doesn’t really capture the essential delusion of Donald Trump, in which he sees himself as a bold, decisive, intellectually dominating leader, and the reality: a pompous, clue-less blow-hard. There would be a lot of comment if they dropped Baldwin. Baldwin would be embarrassed. Lorne Michaels would look mean.
Baldwin is all broad strokes and no nuance. He doesn’t even get the blow-hard part right– he conveys a Trump constantly second-guessing himself, filled with self-doubt and insecurities, and too aware of his failures. He may well be fundamentally insecure, but that’s not evident in the real Trump, and it’s not funny to see it in the parody. (If there is a basis for that element in reality, it’s the moment Trump honestly thought he was “screwed”, and told aides so, at the start of the Mueller investigation.)
Trump doesn’t know he’s an idiot.
He’s probably actually closer to the character Stephen Colbert used to play.