Sure, there was the attempted assassination of Reagan and the fears for Obama as the first black President, but in those cases it was a lone nutter rather than a conspiracy.
How long can Trump crash the market before an angry billionaire decides to take him out? The remaining Koch brother is already pouring money into legal challenges against Trump…
My bingo card/wish list - Trump gets tied up in litigation/impeachment (first pres to be impeached 3 or 4 times…bring it!) until he is out of office (I suspect his Outlook is already set that way). Then, after, nobody says his name ever again because…let’s face it, everyone is just plain embarrassed that it happened - ®'s (D)'s, even whack-a-doo (Others … independent, green, what are those guys that think that everything is transactional…forget).