US President Donald Trump briefly left hospital on October 4, 2020, after announcing on Twitter that he had a “little surprise” for supporters gathered near the Walter Reed National Military Medical Center where he is being treated for Covid-19. Trump was seen waving from inside his armoured vehicle as it passed by crowds on a nearby street. The White House has been accused of giving mixed messages about the president’s condition. White House doctors said on October 4 that Trump was “doing well…