Ralph Peters on CNN says Merkel, May and Stoltenberg were talking to Trump like

[NewJeffCT]

16. From the late Charles Krauthammer, PhD in Psychology from Harvard

about 2 years ago:

This is beyond narcissism. I used to think Trump was an 11-year-old, an undeveloped schoolyard bully. I was off by about 10 years. His needs are more primitive, an infantile hunger for approval and praise, a craving that can never be satisfied. He lives in a cocoon of solipsism where the world outside himself has value — indeed exists — only insofar as it sustains and inflates him.

https://www.washingtonpost.com/opinions/donald-trump-and-the-fitness-threshold/2016/08/04/b06bae34-5a69-11e6-831d-0324760ca856_story.html?utm_term=.4bcd57dbc193

and, since I had to look it up at the time:

Definition of solipsism
: a theory holding that the self can know nothing but its own modifications and that the self is the only existent thing; also : extreme egocentrism

https://www.merriam-webster.com/dictionary/solipsism