Yet this particular show's use of the trope is clearly a reaction to Trump's election. President Marsdin was established in the show at a point when everyone pretty much expected that Hillary Clinton was likely to be our next president, so she was a progressive female POTUS; but once Trump happened, keeping Marsdin in power would've precluded doing social commentary on current events and made the show feel out of touch. So they had to tell a story in which Marsdin was removed and replaced with an old white male successor who was sympathetic to the agendas of anti-immigrant hate groups.
I agree but they way shows have gone after Trump and Trumpism have become a kind of new cliche or trope. I am ready for tv shows and movies to start throwing some new curves because it can get pretty predictable. One thing I like about Lex Luthor is he is nothing like Trump. Cultured and smart and frankly knows how to talk well. Also I think he cares about Lena in his own warped way. I think he is angry that he feels she hasn't lived up to her potential and wants to punish her for letting herself down. Evil of course but in a twisted Lex Luthor way in how he shows he cares about someone.
Jason