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…
Would need an insider that turns. That person has to accept death as the trade off. You’ll be hard pressed to find anyone that fits that situation.
Huey Long’s assassin was an insider who felt personally slighted. Trump loves to slight people.
Especially the type that Trump attracts.
Or any corpo bribe taking politician for that matter, nearly all of them in both parties at the federal level.
In the US, selfishness is a requisite for success. Living an ethical, empathetic life in the United States is a fast track to dying of exposure in a cardboard box under a freeway.