Not that anyone particularly cares about original meaning, but think folks should still say it out loud: For all of the things that are unclear in the founding documents and unknowabilities of what the Founders intended, "the President can kill anyone or commit a coup" was *never* legally arguable
Like there's a lot they were not especially clear about, and all sorts of reasons where we shouldn't tie our own future to their past. But "Kings are bad; the President is not a King; he must be constrained by law" is one of the few things they were, to their credit, very clear about
How generous of you to consider their "originalist" viewpoint as sincere rather than something that at the time conveniently lined up with their undisclosed priorities.
