Several mental health professionals have described Donald Trump as having narcissistic personality disorder. Harvard University's Howard Gardner and clinical psychologist Ben Michaelis are among those who have made this assessment. A 2016 article by Northwestern psychology professor Dan McAdams in The Atlantic and a New York Times article by Jennifer Senior, titled "We Are All at the Mercy of the Narcissist-in-Chief," also support this characterization.
https://www.rawstory.com/raw-investigates/trumps-narcissism/