Oh so you are a mental health professional who has met with Donald Trump and personally evaluated him to be able to say he fits that statement to a tee?
Anyone reading the definition can identify Donald Trump in the definition. It doesn't take a degree to figure it out.
"Narcissistic personality disorder — one of several types of personality disorders — is a mental condition in which people have an inflated sense of their own importance, a deep need for excessive attention and admiration, troubled relationships, and a lack of empathy for others. But behind this mask of extreme confidence lies a fragile self-esteem that's vulnerable to the slightest criticism."
Narcissistic personality disorder - Symptoms and causes