Donald Trump was right. Germs are scary. For three decades, I talked to Trump about his fear of germs. When I interviewed him at the Trump Tower restaurant during the 2016 race, the famous germophobe had a big hospital-strength bottle of hand sanitizer on the table, next to my salad, ready to squirt. He told me about the nightmarish feeling he had when a man emerged from the bathroom in a restaurant with wet hands and shook his hand. He couldn’t eat afterward. Today, in a stunning twist of fate, germs are infecting his presidency and threatening a bad prognosis...