WASHINGTON (AP) — Republicans sought to rewrite the history of the Jan. 6 insurrection during a rancorous congressional hearing Wednesday, painting the Trump supporters who attacked the building as mostly peaceful patriots and downplaying repeatedly the violence of the day.

Democrats, meanwhile, clashed with Donald Trump's former Pentagon chief about the unprepared government response to a riot that began when hundreds of Trump loyalists bent on overturning the election broke through police barriers, smashed windows and laid siege to the building.

The colliding lines of questioning, and a failure to settle on a universally agreed-upon set of facts, underscored the challenges Congress faces as it sets out to investigate the violence and government missteps. The House Oversight Committee hearing unfolded just after Republicans in the chamber voted to remove Rep. Liz Cheney from her leadership post for rebuking Trump for his false claims of election fraud and his role in inciting the attack.

Former acting Defense Secretary Christopher Miller and former acting Attorney General Jeffrey Rosen, testifying publicly for the first time about Jan. 6, defended their agencies' responses to the chaos. But the hearing almost immediately devolved into partisan bickering about how that day unfolded, with at least one Republican brazenly stating there wasn’t an insurrection at all.

“I find it hard to believe the revisionist history that's being offered by my colleagues on the other side," Rep. Stephen Lynch, a Massachusetts Democrat, proclaimed in exasperation.

The violence of that day is well-established, particularly after an impeachment trial that focused on the clashes between rioters and police that left officers beaten and bloodied, including one who was crushed between a door and another shocked with a stun gun before he had a heart attack. Some of the insurrectionists threatened to hang then-Vice President Mike Pence and menacingly called out for House Speaker Nancy Pelosi in an apparent effort to find her in the building.

But Republican lawmakers on the committee sought to refocus the hearing's attention away from those facts, repeatedly equating the insurrection with violence in American cities last summer that arose from racial justice protests that they said Democrats had failed to forcefully condemn.

Rep. Andy Biggs of Arizona played video footage of violence outside the federal courthouse in Portland last summer. Rep. Andrew Clyde of Georgia said that while “there were some rioters” on Jan. 6, it was a “bold-faced lie” to call it an insurrection and likened it in some ways to a “normal tourist visit.”

In ways that fundamentally rewrote the facts of the day and the investigations that resulted, Rep. Paul Gosar of Arizona said the Justice Department was “harassing peaceful patriots." He described Ashli Babbit, a California woman who was fatally shot by an officer during the insurrection after climbing through the broken part of a door, as having been "executed,” even though prosecutors have said the officer won't be prosecuted because the shooting did not break the law.

"It was Trump supporters who lost their lives that day, not Trump supporters who were taking the lives of others,” said Rep. Jody Hice of Georgia, downplaying the violent tactics used by loyalists to the president, including spraying officers with pepper and bear spray.

One Capitol Police officer who was injured while confronting rioters suffered a stroke and died a day later of natural causes. Dozens more were severely injured, some of whom may never return to duty.

“This was a violent white supremacist mob who assaulted the nation’s Capitol" said Democratic Rep. Ayanna Pressley of Massachusetts. "It was a deadly and dangerous insurrection that was incited by Donald Trump.”

For their part, Democrats clashed with Miller over the hours-long gap between when National Guard support was first discussed and the time troops arrived.

Rep. Ro Khanna of California told Miller he was dumfounded “we had someone like you in that role.” After Miller described a statement from Lynch, the Massachusetts congressman, as “ridiculous,” Lynch replied that Miller himself was ridiculous.

“You were AWOL, Mr. Secretary,” said Democratic Rep. Raja Krishnamoorthi of Illinois.

“That's completely inaccurate,” Miller replied. “That's completely inaccurate.”

In testimony aimed at rebutting broad criticism that military forces were too slow to be deployed, Miller told the committee he was concerned before the insurrection that sending troops to the Capitol could fan fears of a military coup and cause a repeat of the deadly Kent State shootings in 1970.

“No such thing was going to occur on my watch, but these concerns, and hysteria about them, nonetheless factored into my decisions regarding the appropriate and limited use of our armed forces to support civilian law enforcement during the Electoral College certification,” Miller said. “My obligation to the nation was to prevent a constitutional crisis.”

Miller said that though military involvement in domestic law enforcement should be a “last resort,” he regarded the speed at which the National Guard was dispatched as among the most expedient deployments in history. He said he stood by each decision he made that day.

He said that though he believed Trump had encouraged his supporters to protest the election results, he did not believe Trump's rhetoric — which led to his impeachment — was the “unitary” factor in the riot. That drew complaints from Democrats, who said Miller appeared to be softening criticism of Trump that he voiced in earlier media interviews.

Trump was ultimately acquitted by the Senate of having incited the riot.

Miller denied that Trump had any involvement in the Defense Department's response, saying the two of them did not speak that day. Democrats nonetheless honed in on Trump and his role in the riot.

″The failures of Jan. 6 go beyond the craven lies and provocations of one man," said Rep. Carolyn Maloney, a New York Democrat and the committee's chairwoman.

Rosen in his testimony defended the Justice Department's preparation and also said there was no evidence of widespread election fraud that could have caused the results to be voided. His former boss, William Barr, has said the same.

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Associated Press writer Nomaan Merchant in Washington contributed to this report.