This story was updated at 8:41 a.m. on Tuesday, Jan. 12, to include news of a second House lawmaker, Rep. Pramila Jayapal (D-Wash.), testing positive for COVID-19 after the lockdown.
Rep. Markwayne Mullin (R-Okla.) was captured on video refusing to wear a mask when offered one as lawmakers sheltered in a crowded conference room during the dramatic Wednesday attack on the U.S. Capitol by supporters of President Donald Trump.