On Monday morning we awoke to images of Donald Trump returning by helicopter to the White House after a weekend stay in hospital with Covid-19. The commander-in-chief who turned to the camera and dropped the mask. The White House physician gave the president a clean bill of health on Thursday. Sean Conley, who is an osteopath not a general practitioner, gave the president the green light to resume public engagements on Saturday. But the Democratic Speaker of the House wants to know when his last negative test was.