The figures are across 15 networks and are an average from the 10:30 a.m.-7 p.m. Nearly 40 million watched Bidens swearing in and inaugural address four years ago on those six networks.
In 2017, about 38.3 million watched Trumps first inauguration.
CNN drew the largest viewership almost 10 million, while MSNBC garnered 6.53 million.
Donald Trump is sworn in on MondayRicky Carioti - Pool/Getty Images
The figures are from Nielsen via Fox News.
Second presidential inaugurations traditionally draw far fewer viewers than the first.
