The second presidential debate between US president Donald Trump and his challenger Joe Biden has been cancelled after Trump refused to participate in a virtual format. The Commission on Presidential Debates had on Thursday announced that it was converting the October 15 town hall debate to a virtual affair out of caution because Trump had tested positive for the coronavirus. But Trump refused the format insisting on in-person debate. Biden had earlier said that he would not debate Trump if he still had the virus. The move leaves just one more debate on the schedule to be held on October 22 in Nashville before the November 3 election.