WATCH LIVE: Jan. 6 Hearing to Focus on How Far-Right Extremists Answered Trump's 'Siren Call'

The House committee investigating the January 6, 2021 attack on the U.S. Capitol is set to document how far-right extremists answered former President Donald Trump's "siren call" to converge in Washington for a lie-fueled "stop the steal" rally that descended into violent chaos.

"Big protest in D.C. on January 6th. Be there, will be wild!" Trump tweeted just before 2:00 am on December 19, 2020.

" Donald Trump sent out the tweet that would be heard around the world, the first time in American history when a president of the United States called a protest against his own government, in fact, to try to stop the counting of Electoral College votes in a presidential election he had lost," Rep. Jamie Raskin (D-Md.) said Sunday in an appearance on CBS' "Face the Nation."

"People are going to hear the story of that tweet, and then the explosive effect it had in Trump World and specifically among the domestic violent extremist groups, the most dangerous political extremists in the country," said Raskin.

The hearing is scheduled to begin at 1:00 pm ET. Watch live:

The Proud Boys, Oath Keepers, QAnon, and other right-wing groups with members now facing sedition charges over the deadly coup attempt will be the focus of Tuesday's hearing.

"We will lay out the body of evidence that we have that talks about how" Trump's December 19 tweet was a "siren call" to far-right extremists who stormed the halls of Congress in an attempt to prevent lawmakers from certifying President Joe Biden's Electoral College victory, panel member Rep. Stephanie Murphy (D-Fla.) toldNBC's "Meet the Press" on Sunday.

The panel's seventh public hearing since mid-June is set to examine what it calls "the final phase of Trump's multi-pronged effort" to cling to power following his loss in the 2020 presidential election, the Associated Pressreported. "As dozens of lawsuits and false claims of voter fraud fizzled, Trump tweeted the rally invitation, a pivotal moment, the committee said."

According to AP:

Among those expected to testify is Stephen Ayres, who pleaded guilty last month to disorderly and disruptive conduct in a restricted building. He admitted that on Jan. 2, 2021, he posted an image stating that Trump was "calling on us to come back to Washington on January 6th for a big protest." Another witness is Jason Van Tatenhove, an ally of Oath Keepers leader Stewart Rhodes. The witnesses were confirmed by someone familiar with the testimony who spoke on condition of anonymity because the witnesses had not yet been announced.

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What the committee intends to probe Tuesday is whether the extremist groups, including the Proud Boys, Oath Keepers and QAnon adherents who had rallied for Trump before, coordinated with White House allies for Jan. 6. The Oath Keepers have denied there was any plan to storm the Capitol.

The panel is also expected to highlight new testimony from Pat Cipollone, the former White House counsel, who "was aware of every major move" Trump was making, said Rep. Jamie Raskin (D-Md.) who will lead the session.

"We'll show how some of these right-wing extremist groups who came to D.C. and led the attack on the Capitol had ties to Trump associates, including Roger Stone and General [Michael] Flynn," a committee aide said Monday.