https://www.salon.com/2017/09/12/harvard-psychiatrist-lance-dodes-donald-trump-is-a-sociopath-and-a-very-sick-individual/
"Trump’s case of narcissism is particularly severe because he also is out of touch with reality whenever he becomes upset. When he says, “I had the largest crowd at an inauguration in history,” it does not matter that you can tell him that it is not true, he still insists on it. Well, that is very troublesome because what it means is that he needs to believe it. He is able to give up reality in exchange for his wished-for belief. Sometimes we call that a delusion. We have not used that word much with Donald Trump because that does get confused with people who think that they are Napoleon. But Trump has a fluid sense of reality, which is a sign of a very sick individual. Sociopathy itself is a sign of a very sick individual, someone with a lying, cheating and emotional disorder. The intersection of those two occurs in sociopathy. It is not just bad behavior that people have to lie and cheat the way he does, it is an incapacity to treat other people as full human beings. That is why his focus is on humiliating others to aggrandize himself, as he did in the Republican primaries when he was debating and calling people names. The same thing applies to Hispanic immigrants and separating the children from their parents. That is a very, very serious mental and emotional problem. Normal people have normal empathy. It is part of being a human being. Lying and cheating and humiliating others and grinding them into dust in order to triumph is not just bad behavior. It is a serious mental illness."