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WASHINGTON (AP) — A committee investigating the Jan. 6 Capitol insurrection opened its first hearing Tuesday with a focus on the law enforcement officers who were attacked and beaten as the rioters broke into the building — an effort to put a human face on the violence of the day.

“There’s no place for politics and partisanship in this investigation,” said the panel’s chairman, Mississippi Rep. Bennie Thompson, as he opened the session.

The police officers who are scheduled to testify endured some of the worst of the brutality. They were punched, trampled, crushed and sprayed with chemical irritants. They were called racial slurs and threatened with their own weapons as the mob of then-President Donald Trump’s supporters overwhelmed them, broke through windows and doors and interrupted the certification of Democrat Joe Biden’s presidential win.

Testifying will be Capitol Police officers Harry Dunn and Aquilino Gonell and Metropolitan Police officers Michael Fanone and Daniel Hodges.

In previous interviews, Dunn has said that attackers yelled racial slurs and fought him in what resembled hand to hand combat as he held them back.

Gonell, an Iraq veteran, detailed surgery on his foot and injuries from which he struggled to recover. Fanone has described being dragged down the Capitol steps by rioters who shocked him with a stun gun and beat him. Hodges was beaten and crushed between two doors, and his bloody face and anguished screams were caught on video.

Thompson played video of the attack and told the police officers: “History will remember your name.” He said the rioters “came ready for a fight, and they were close to succeeding.”

The panel’s first hearing comes as partisan tensions have only worsened since the insurrection, with many Republicans playing down, or outright denying, the violence that occurred and denouncing the Democratic-led investigation as politically motivated. Democrats now want to launch the probe — and win public support for it — by reminding people how brutal it was, and how the law enforcement officers who were sworn to protect the Capitol suffered grave injuries at the hands of the rioters.

Wyoming Rep. Liz Cheney, one of two Republicans on the panel, gave opening remarks after Thompson — an effort by Democrats to appear as bipartisan as possible. She said the investigation must be nonpartisan.

“The question for every one of us who serves in Congress, for every elected official across this great nation, indeed, for every American is this: Will we adhere to the rule of law, respect the rulings of our courts, and preserve the peaceful transition of power?” Cheney asked. “Or will we be so blinded by partisanship that we throw away the miracle of America?”

The House Republican leader, Kevin McCarthy, withdrew the participation of other Republicans last week after Pelosi rejected two of them, saying their “antics” in support of Trump, and his lies that he won the election, weren’t appropriate for the serious investigation. Monday evening, the House voted against a resolution offered by the GOP leader to force the members to sit on the panel.

McCarthy has stayed close to Trump since the insurrection and has threatened to pull committee assignments from any Republican who participates on the Jan. 6 panel. He has called Cheney and Illinois Rep. Adam Kinzinger, who is also sitting on the committee, “Pelosi Republicans,” an effort that Cheney immediately dismissed as “childish.”

Ahead of the hearing on Tuesday, McCarthy again called the process a “sham” and said Pelosi only wants the questions asked “that she wants asked.”

McCarthy told reporters that Pelosi should be investigated for her role in the security failures of the day but ignored questions about Senate Republican Leader Mitch McConnell, who had identical authority over the Capitol Police and Capitol security officials

Democrats said ahead of the hearing that they want the public to remember what happened.

“What we really want to try to communicate during the hearing is what it was like to be on the front lines for these brave police officers,” said House

Intelligence Committee Chairman Adam Schiff, another member of the panel. “How vastly outnumbered they were, how well militarized the members of the crowd were.”

The hope, Schiff said, is to “inform the public of what really happened that day, particularly in light of the efforts to whitewash that part of our history now.”

Thompson aid the hearing will “set the tone” of the probe, which will examine not only Trump’s role in the insurrection but the right-wing groups involved in coordination before the attack, white supremacists among them.

It will also look at the security failures that allowed hundreds of people to breach the Capitol and send lawmakers running for their lives. Some of those who broke in were calling for the deaths of House Speaker Nancy Pelosi and then-Vice President Mike Pence, who was hiding just feet away from the mob.

Outside of a committee preparation session for the hearing on Monday, Kinzinger told reporters that “for too long, we’ve been pretending that Jan. 6 didn’t happen.” He said he never expected to be in this position, “but when you have these conspiracies that continue to thrive, when you have lies and misinformation that continue to thrive, it’s essential for us as members of Congress to get to the answers.”

Shortly after the insurrection, almost every Republican denounced the violent mob — and Trump himself, who told his supporters to “fight like hell” to overturn his defeat. But many have softened their tone in recent months and weeks.

And some have gone farther, with Georgia Rep. Andrew Clyde saying a video of the rioters looked like “a normal tourist visit” and Arizona Rep. Paul Gosar repeatedly saying that a woman who was shot and killed by police as she was trying to break into the House chamber was “executed.” Others have falsely claimed that Democrats or liberal groups were responsible for the attack.

On Tuesday, a group of GOP members plans to hold a news conference about the insurrectionists who were arrested, calling them “prisoners.”

The officers testifying have become increasingly politically active in recent months, and went from office to office in May to lobby Senate Republicans to support an outside commission to investigate the insurrection. The Senate GOP ultimately rejected that effort, even though that panel would have been evenly split between the parties.