Biden and the first lady, visited Brookland Middle School in Washington, D.C., along with DC Mayor Muriel Bowser, and spoke to students, school staff, and the nation about keeping children safe in schools and how important the COVID-19 vaccines are. Joe Biden called some Republican governors “cavalier” on Friday for resisting his call for far-reaching new federal coronavirus vaccine requirements he hopes will curb the surging delta variant. He also pushed back against Republicans, and some union officials, who say he is overreaching his authority. Biden said they were shirking their responsibility to young Americans. “I am so disappointed that...