In New York Times, Peter D. Kramer and Sally L. Satel imply President Trump has narcissistic personality disorder, but it would not explain him.

According to Drs. Kramer and Satel, in any evaluation of Mr. Trump’s fitness for office, “…diagnosis might be the easy part…many experts believe that Mr. Trump has a narcissistic personality disorder.” https://www.nytimes.com/2017/08/29/opinion/trump-unfit-goldwater-rule.html?ref=opinion

In my opinion, Mr. Trump has narcissistic traits, not narcissistic personality disorder, but it does not matter, because narcissism is not the main issue, which is extraordinary inconsistency and lying. https://www.nytimes.com/interactive/2017/06/23/opinion/trumps-lies.html?mcubz=0.

If Mr. Trump warrants any psychiatric diagnosis, it must explain his extraordinary inconsistency and lying.