NYT 22 Nov 23:
“Trump is an aging malignant narcissist,” Aaron L. Pincus, a professor of psychology at Penn State, wrote in an email. “As he ages, he appears to be losing impulse control and is slipping cognitively. So we are seeing a more unfiltered version of his pathology. Quite dangerous.”
https://www.nytimes.com/2023/11/22/opinion/trump-danger-rage-psychology.html