"Since the start of Donald Trump's presidential run, one question has quietly but urgently permeated the observations of concerned citizens: What is wrong with him? Constrained by the American Psychiatric Association's "Goldwater rule," which inhibits mental health professionals from diagnosing public figures they have not personally examined, many of those qualified to answer this question have shied away from discussing the issue at all. The public...

"He's only getting worse. Donald Trump's erratic behavior throughout his presidential campaign caused many of us to ask: What is wrong with him? After the election, politicians and pundits assured us he would change once he took office and would live up to his role as president. After spending two years in the most powerful position in the world, however, Trump has only gotten worse. He rants. He lashes out. He threatens violence. He holds rallies...