Mary L. Trump, the niece of former U.S. President Donald Trump, had written a book titled "Too Much and Never Enough: How My Family Created the World's Most Dangerous Man," in which she discussed her views on her uncle's psychological characteristics. In the book, she, as a clinical psychologist, claimed that Donald Trump met all the criteria for narcissism.
It's important to note that diagnosing someone with a mental health condition, especially a personality disorder like narcissism, requires a comprehensive and formal evaluation by a qualified mental health professional who has directly interacted with the person in question. I would not be aware of them. Therefore, for the most current information, it's best to refer to the latest sources and updates available.