WATCH: Mike Lindell and Michael Flynn sing national anthem with jailed Capitol rioters

MyPillow CEO Mike Lindell and former national security adviser Michael Flynn joined hundred of others who dialed in to a virtual rally for jailed Capitol rioters.

A video posted Sunday night by the Patriot Freedom Project shows Lindell, Flynn and about 200 other people singing the "Star-Spangled Banner" with inmates at the D.C. jail, where accused insurrectionists are being held as they await trial, reported Vice News.

The jailed rioters have been singing the national anthem at 9 p.m. each night, and Lindell and Flynn -- two of Donald Trump's most high-profile election conspiracy boosters -- joined in the virtual rally, along with Lindell associate David Clements, a New Mexico State University business professor.