http://www.newsweek.com/are-mrna-vaccines-safe-how-long-been-development-biden-covid-mandate-pfizer-1627758

On Thursday, President Joe Biden announced a wide-reaching federal vaccine mandate, in a bid to get millions more Americans immunized in order to squash the country's COVID outbreak.

The president said the new mandate, which could affect as many as 100 million U.S. citizens, came in response to the surging Delta variant, as well as the vast number of people in the country who are unvaccinated. He said that people's refusal to get a vaccine "has cost all of us."