Congressional leaders reached an agreement on a $900 Billion coronavirus relief bill, part of a spending measure that funds the government through September 2021; distribution of the second coronavirus vaccine began to more than 3,700 locations in all 50 states; European nations are banning travel from the UK after a new variant of covid-19 was detected in the country, but health experts warn mutations are expected and nothing suggests this is more deadly; Trump and his aides are floating the idea of using martial law to overturn the elections.