There is a new book on Trump's personality deficiency . . .

"The Dangerous Case of Donald Trump: 27 Psychiatrists and Mental Health Experts Assess a President"

I haven't read it yet, but their highly qualified and professional armchair conclusions is that our POTUS is has a "Malignant" personality, a "Narcissist", a narcissistic personality with paranoia.  Fits him to a "T".