Chairman Bennie Thompson will warn the American public of the ongoing threat from "those in this country who thirst for power" when the Jan. 6 committee soon kicks off a series of public hearings laying out its investigation, according to an opening statement released by the committee.

"So tonight, and over the next few weeks, we're going to remind you of the reality of what happened that day. But our work must do much more than just look backwards. Because our democracy remains in danger," Thompson is expected to say. "The conspiracy to thwart the will of the people is not over."

"January 6th and the lies that led to insurrection have put two and a half centuries of constitutional democracy at risk. The world is watching what we do here," read the excerpt.

One of the first officers injured on Jan. 6, U.S. Capitol Police officer Caroline Edwards, who suffered a traumatic brain injury after she was thrown to the ground by rioters pushing bike racks, will deliver her firsthand account before the committee in a matter of hours.

Documentary filmmaker Nick Quested, who followed the Proud Boys through Washington as members of the extremist group marched on the Capitol and clashed with law enforcement, is also scheduled to testify live.

ABC News exclusively obtained some of Quested's extraordinary material, showing how a group of Trump supporters at a presidential rally transformed into an angry mob that broke into the Capitol. Click here for more.

House Minority Leader Kevin McCarthy, R-Calif., wouldn’t say Thursday if President Joe Biden was the legitimate winner of the 2020 election.

ABC News Chief Washington Correspondent Jonathan Karl pressed McCarthy on the matter four times during a news conference where House Republicans preemptively slammed tonight’s hearing, calling the Jan. 6 panel "the most political and least legitimate committee in American history."

McCarthy said Biden is the president, but declined to address the legitimacy aspect and declined to say Trump was wrong when he baselessly claimed the election was fraudulent.

The select committee has promised never-before-seen videotaped depositions from some of Trump's closest aides and family members after Ivanka Trump, Jared Kushner and Donald Trump Jr. all sat for interviews earlier this year.

Former White House chief of staff Mark Meadows -- who turned over thousands of text messages to the committee -- has been described by congressional sources as an "MVP" of the hearings, as his messages have provided somewhat of a roadmap for investigators.

Click here for some key players to watch for as the panel kicks off a series of major public hearings.

Demonstrators gathered outside the U.S. Capitol on Thursday ahead of the House select committee's first prime-time hearing of its Jan. 6 investigation.

Participants held signs reading, "Not above the law."

The panel is looking to explain what it calls a "coordinated, multi-step effort" by Trump and his supporters to overturn his 2020 election loss.