A new political war over masks is already deepening the national divides that slowed vaccinations and thwarted what once seemed an imminent victory over Covid

Biden to announce vaccination requirement across federal government today

CDC director says Delta variant acts differently than past strains

Anti-mask protesters forced school board to postpone a meeting

CDC updates guidance, recommends vaccinated people wear masks indoors in certain areas

Fauci on new guidance: Science hasn't changed, the virus has