Replacing the king with a double

Ann Althouse links to an essay that wonders if Yanks would be upset if Biden is being manipulated by his staffers, and refers to the movie Dave, where a body double takes the place of the President.

comments point out this has been done in literature/movies: as in Kurasawa's Kagamusha and in Heinlein's Double Star.

In both these stories, the human was humble enough not to change things (although in Double Star, he opposed a staff member who was bullying him to change the original president's agenda).

If all this sound like fiction, it is: Except that the Huff Post suggests this be done with AI.