NBC Nightly News Broadcast (Full) – December 21st, 2020 | NBC Nightly News

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Growing concern over new coronavirus strain in U.K., President-elect Biden receives Covid vaccine, and dozens of West Point cadets accused of cheating on a math exam.

Watch “NBC Nightly News With Lester Holt” at 6:30 p.m. ET / 5:30 p.m. CT…