I don't know, I think all politicians is fair. Unless they're like, SUPER retired from politics, and they're doing the show to promote their charity that finds shoes for disadvantaged children with two different sized feet or something.
I can't think of a politician I would want on the show, even one I liked. (If I like them, I want them to be doing important things, not this!) I think a lot of times, the complaint "don't talk about politics here" is used to silence marginalized voices, but in this context, it's already enforced. So you end up with this person whose mere existence is pol