The subject of the video Cuoy Griffin, a county commissioner in New Mexico and founder of "Cowboys for Trump", has now been arrested for his participation.
Investigators added Griffin posted a video to Facebook where he stated: “If we do, then it’s gonna be a sad day, because there’s gonna be blood running out of that building.”
Trump supporters stormed the Capitol building while Congress was certifying Biden's victory in the 2020 presidential election.
Griffin told the FBI he stood on the steps of the building but did not enter it.
The criminal complaint records his offence as “knowingly entering or remaining in any restricted building or grounds without lawful authority”.
People are now again looking at Trump’s support for the original video posted last year and questioning Griffin’s earlier visit to the Oval Office.
Griffin previously said he meant “the only good Democrat is a dead Democrat” in a “political sense”.
Journalist Grace Reader shared the court documents outlining his involvement.
There are more demands for Griffin to resign from office, including from the attorney general of New Mexico.
Authorities have arrested more than 100 people in connection with the siege so far.