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…
Except for the assassination of Abe, which was a resounding success by any measure. The perp got everything he wanted and more.
President Garfield also got merked. Mostly the fault of an RFK-grade doctor than the actual shooter, though. I hope we get that for Trump - he deserves to die at the paws of his own incompetent administration.