Narcissists also may try to bury their lack of knowledge or poor behavior in an avalanche of words, and this is what our current president does every day. Read any part of this bizarre transcript of a press event President Donald Trump held with Italian president Sergio Mattarella and your head will start spinning.

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In early 2017, I was one of a group of experts on violence, psychopathology, and authoritarianism who wrote the bestselling book “The Dangerous Case of...