While David Muir's newscast was No. 1 in total viewers, Lester Holt was No. 1 in the key 25-54 demo during the first week of the Winter Olympics. Because NBC is airing live across the country, NBC Nightly News is also being shown live coast-to-coast at 6:30 p.m. ET/3:30 p.m. PT. ALSO: Today was dominant during the first week of the Winter Olympics.