if you're going to see grandma tonight within a half hour, take the test. it might show up differently than it did yesterday or the day before. they are most effective when taken a couple of days apart. lindsey. >> wow, a line around the block on christmas day. liz mclaughlin, thank you. >> it's been a dialed back christmas at the white house as the bidens celebrate their first christmas. covid is putting a dampener on the usual oval office festivities. joe biden and vice president kamala harris have once again tested negative after being in contact with people who had contracted the virus. nbc's josh lederman is at the white house. what can you tell us about how the president and first lady are spending the day. >> typically this would be the time when the white house would be throwing a series of holiday parties here at the white house. the bidens have a long-standing family tradition of going to the virgin islands for christmas. none of that is happening because of omicron. the parties for the most part are canceled, and the bidens are