Determining that Trump is mentally "unfit" for the job should not be a problem.
More than 55,500 mental health professionals have signed a petition warning that Donald Trump is suffering from a grave emotional instability that makes him incapable of serving safely as the president of the United States.
The petition is conducted by the group Duty to Warn,  headed by Dr John Gartner, a psychologist who taught in the department of psychiatry at Johns Hopkins University Medical School for 28 years, and now practises in Baltimore and New York.
Caligula, Nero, France's Charles The Mad, King George III of the United Kingdom, Bavaria's "Mad King Ludwig."
Now we can add President Donald Trump to the list.