Democratic presidential nominee, former US Vice President Joe Biden (R), and vice presidential running mate, US Senator Kamala Harris, hold a press conference after receiving a briefing on COVID-19 in Wilmington, Delaware, on August 13, 2020. (Photo WILMINGTON, Del. - Joe Biden is calling for a nationwide protective mask mandate, citing health experts' predictions that it could save 40,000 lives from coronavirus over the next three months. "Wearing the mask is less about you contracting the virus," Biden said. "It's about preventing other people from getting sick."The Democratic presidential candidate also responded to those who push back against such mandates."This is America.