Donald Trump Jr. tests positive for Covid-19, police respond to shooting at Wisconsin mall, and Pfizer applies for emergency use authorization for its Covid-19 vaccine.Watch NBC Nightly News With Lester Holt at 6:30 p.m. ET 5:30 p.m. CT (or check your local listings).00:00 Intro01:30 Donald Trump JR. Tests Positive For COVID-1901:36 Mall Shooting Leaves Multiple People Injured04:07 Pfizer Seeks FDA Emergency Approval For Vaccine06:38 New Crackdowns As U.S. Tops 185,000 Daily COVID Cases08:50 1 In 5 U.S. Hospitals Faces Dire Staffing Shortages10:49 Trump Falsely Claims 'I Won' The Election11:10 Georgia Certifies Biden Victory After Hand Recount11:29 Trump Hosts Michigan GOP As He Seeks To Overturn Defeat12:42 Biden Celebrate 78th Birthday, Meets Top Democrats13:17 Massive Testing Crush Ahead Of Thanksgiving14:50 Judge Hails 'Daniel's Law' Named After Slain Son15:48 Long Lines As Travelers Defy CDC Holiday Warning17:07 High-Speed Police Chase Ends With Pond Plunge