There was a film called "The Madness of King George" in the 90s. [didn't watch it]
In the 2000s when Bush was in power, then people were using posters from that film to express their disapproval for the president. King George as in George W. Bush.
But those were only for funny display, not literal. Today's news : Trump is showing erratic behavior and people are really concerned about his mental health.
https://www.businessinsider.com/trump-aides-worried-about-mental-state-alabama-hurricane-dorian-2019-9