Ahmm... about that, from the horse's mouth:
Well, one of the horses anyway.
The source should be respectable, I hope, at least for some: https://www.nytimes.com/2017/02/14/opinion/an-eminent-psychiatrist-demurs-on-trumps-mental-state.html
The problem with that is that the diagnosis of mental illnesses is not an exact science. In fact, the Diagnostic Manual of Mental Illnesses is periodically rewritten, and indeed Allen Frances played a prominent role in earlier versions but he started opposing the now current DSM-5 since 2010 with a blog. According to Wikipedia, "He spoke out against the overuse of psychiatric medications—particularly in children; a general trend towards global diagnostic inflation—pathologizing normality; the intrusion of the pharmaceutical industry into psychiatric practice; and a premature attempt to move psychiatry to an exclusively biological paradigm without scientific justification".
So, while he may have good reasons to do so, we must also see his latest statements a bit in in that light. A number of his colleagues as we have read earlier, although they (correctly) won't call it a diagnosis, do point out that his public behavior does match the points on a checklist that would lead to the diagnosis of Narcissistic Personality Disorder. I'll leave it to the experts in the field to decide.
At any rate, it seems highly problematic to have a person with his personality running the ship. He (or rather his advisor Bannon) seems destined to disrupt other parts of the world in order to come out on top himself. The situation in Israel, the situation in Turkey and Crimea (and potentially the Baltics), the situation in the Middle East and Africa, the return to hostility towards Iran, the breaking up of trade agreements, the discrimination on basis of Faith or origin, the contempt and marginalization of the Judiciary, his under-rating of security concerns by using insecure phones for communication, the internal struggle with the national security services, his undisclosed personal/business ties and dependencies with foreign powers, the contempt for science (and other more factual information), the dismissal of environmental concerns, the list goes on.
Cheers,
Bart