WASHINGTON : Defying critics, U.S. President Donald Trump on Tuesday said Americans were learning to live with COVID-19, a day after returning to the White House for further intensive treatment after being hospitalized with the coronavirus.Trump, who returned late on Monday after nearly four days at Walter Reed Medical Center outside Washington, was due to receive a fifth transfusion of the antiviral drug remdesivir while being treated with the steroid dexamethasone, normally used only in the most severe cases.The Republican president, who is running against Democrat Joe Biden in an election four weeks away, has repeatedly played down the disease, which has killed more than 1 million people worldwide.