I'm not the first to say it by a long shot but Trump is most like Berlusconi to me. Mob linked, egregiously corrupt, and (most likely) a criminal. I think Trump's personality is considerably more malignant than Berlusconi's however and while you're right he's not allowed to be a dictator right now Trump shows extremely dangerous impulses in that direction that we need to guard against.
If this nonsense with Trump turns out to be as bad as I feel it will Nunes will go down in history in a very bad way. His response to learning that a hostile foreign power attacked our election in order to install their preferred candidate as president has been to undermine federal law enforcement trying to get to the bottom of it. And how's he been doing that undermining? Through egregious, transparent lies.
If the Democrats can take the House he will at least lose his chairmanship that he's using to do so much damage to our country but really he needs to lose his seat. He can't be prosecuted for his actions even though he deserves to be, but we can at give him the boot. (after which I'm sure some right wing group will pick him up for a comfortable salary)