that starts at 8:00 a.m. eastern. tomorrow evening, a special tribute to the families of september 11th "shine a light" is at 8:00 p.m. eastern. on sunday, dana bash will talk to joe manchin as well as bernie sanders at 9:00 a.m. and noon eastern. our coverage continues now with wolf blitzer in "the situation room." happening now, president biden defends his new covid vaccine mandates affecting millions of americans, and he's challenging republican governors threatening lawsuits to, quote, have at it. also tonight new evidence that law enforcement officials prepared for a possible mass casualty event on january 6th and it is raising more questions about whether police are ready for the worst when pro insurgents rally at the capital