Coronavirus updates: US sees deadliest day — again; Biden asks for 100 days of masks; California has a new regional stay-at-home order December 4, 2020 California has a new regional stay-at-home order. US sees its deadliest day. And President-elect Biden says he’ll ask Americans to wear masks for 100 days. http://rssfeeds.usatoday.com/~/639582386/0/usatoday-newstopstories~Coronavirus-updates-US-sees-deadliest-day-%E2%80%94-again-Biden-asks-for-days-of-masks-California-has-a-new-regional-stayathome-order/