“He’ll do whatever I want him to do,” Donald Trump declared recently about Israeli Prime Minister Benjamin Netanyahu. The statement may be one of the most revealing statements Trump has ever made—not for what it says about Netanyahu, but for what it reveals about Trump’s psychology. It was intended as a display of strength. Instead, it exposed the opposite. Trump has built a political persona around hyperbole, self-aggrandizement, and declarations of superiority to cover up for an oversized inferiority complex, he only knows its extent. When he insists that Netanyahu is acting at his command, he is projecting an authority he does not possess. The louder the boast, the more apparent the insecurity beneath it. If there is one lesson [...]