Marine One landed on the White House lawn just before dusk. As its rotors came to a halt, the helicopter’s door swung open and out stepped Donald Trump. The president had just spent three days in Walter Reed National Military Medical Center recovering from covid-19, the disease caused by the novel coronavirus. And in a scene that would be set to dramatic music and tweeted to his 87 million followers, he climbed the steps to a White House balcony, took off his face mask and recorded a video urging the country not to fear the deadly disease.