It is very difficult to clearly define a psychopath as distinct from a sociopath. Neither word is used officially anymore. That allows Trumpists to deny any of it. But if you have ever dealt with a was defined as a psychopath that always includes a level of pathological narcissism, Trump may as well have a neon sign on is head.
These types of people are in intense pain relieved only by manipulation of others and their demands for constant praise with public fawning and groveling. They never get better, to my knowledge, but only worse until they destroy themselves and those around them.
That is why hundreds of clinical psychologists and psychiatrists have continuously published letters warning what would happen with a high functioning but severe form of this disorder occupying the office of the president.
It is happening before our eyes.