Donald Trump and his alleged narcissistic personality disorder (NPD) have been all over the political media. Recently a Democratic Congressman started a petition calling for Mr. Trump to be psychologically diagnosed because of the risk that he has NPD and that this makes him unfit for office. As someone who has spent a good deal of time researching narcissism, I am asked about Mr. Trump constantly by journalists, friends and even strangers who find out what I do. As much as I appreciate the work professional journalists do, I wanted to address three important questions about Mr. Trump and narcissism without an editorial filter. Is Mr. Trump narcissistic? Does Mr. Trump suffer from NPD? Would narcissism and NPD — if present — disqualify Mr. Trump from being a U.S. President? Is Mr. Trump narcissistic? Mr. Trump’s persona, or public image, has clear elements of grandiose narcissism. That is, he appears grandiose and in possession of a strong ego; he is willing to act aggressively to others and can appear emotionally callous rather than warm; and he is …