Last week, the CDC announced its new recommendation that all Americans should wear masks when they're in public. They stated that because people can spread the virus before they're symptomatic and because 25% of people who are carriers will not develop symptoms, wearing a mask in public is the best way to prevent spreading coronavirus.
President Trump affirmed this recommendation during his coronavirus press briefing. But he also stressed that wearing face masks in public was voluntary.
High-profile politicians, including President Trump and Joe Biden, have very different opinions about the recommendations.