UPDATE: Part of the vice presidential debate was devoted to each candidate’s blunders.

Tim Walz asked about his previous claim that he was in Hong Kong when the Tiananmen Square riots and massacre occurred in 1989. In fact, Walz was not there during the protests that culminated in Beijing’s crackdown in June of that year.

“I got there last summer and made a mistake,” Walz said. He said he was a “knucklehead” at times.

Vance was asked about his past comments disparaging Trump after once comparing him to Hitler, as well as his disparagement of his time as president. As he did before, Vance accused the media of hijacking her coverage of Trump.

PREVIOUSLY: The debate moderators are conducting a fact check, which led to a tense moment with JD Vance.

At one point, co-host Margaret Brennan noted that a large number of Haitian migrants have legal status in Springfield, Ohio. Vance has claimed that illegal immigration has destroyed this community.

Vance interjected, “The rules stated that you wouldn’t fact-check, and since you’re fact-checking me, I think it’s important to say what’s going on,” implying that it would be relatively easy, to obtain legal status.

Brennan then said, “Thank you, Senator, for describing the legal process. We still have so much to tell the senator.”

“It’s been on the books since 1990,” Walz interjected.

The two candidates continued to fight, but their microphones were now muted. “The audience can’t hear you because your microphones are turned off,” Brennan said as she moved on to another topic.

CBS News said before the debate that while the candidates would not be fact-checked like on Sunday shows, it would still be up to the moderators when to intervene. The station also said it reserved the right to mute the microphones.

Previously, during a discussion on climate, co-host Norah O’Donnell also noted, “The overwhelming consensus among scientists is that Earth’s climate is warming at an unprecedented rate.”

PREVIOUSLY: Senator JD Vance (R-OH) and Governor Tim Walz (D-MN) opened the vice presidential debate with an argument over who is responsible for the unfolding crisis in the Middle East.

After Iranian missiles fell on Israel, co-host Margaret Brennan asked House candidates whether they would support or oppose a preemptive strike by Israel against Tehran’s nuclear capabilities.

Walz didn’t answer the question directly, but instead used the time to attack Donald Trump’s fitness for office, saying, “An almost 80-year-old Donald Trump talking over crowds is not what we need at this moment.”

“It is those closest to Donald Trump who understand how dangerous he is when the world is so dangerous,” Walz said, referring to the members of his administration who warned against him, as well as Vance himself.

He accused Trump of pulling out of the Iran nuclear deal.

“Iran is closer to a nuclear weapon than ever before because of Donald Trump’s capricious leadership,” Walz said.

Vance, meanwhile, said Trump ushered in an era of stability, saying he “realized that you need peace through strength to make people fear the United States.”

“They had to realize that if they stepped out of line, United States global leadership would bring stability and peace back to the world,” he said.

Vance blamed Harris for being part of a government as Iran expanded its nuclear program.

“You blame Donald Trump. “Who has been vice president for the last three and a half years?” Vance said.

This will likely be the only debate between Vance and Walz — and possibly the last election year this cycle takes place. Donald Trump has so far rejected another duel with Kamala Harris, who accepted CNN’s plans for a presidential debate on October 22nd. Trump and Harris have held only one debate, an ABC News-sponsored event on Sept. 10.

The candidates appeared in a broadcast studio without an audience while the political press watched on monitors in another part of the CBS Broadcast Center complex.

Typically, vice presidential debates have little impact on a presidential race. One of the most memorable moments occurred in 1988 when Democrat Lloyd Bentsen, Michael Dukakis’ running mate, disparaged Dan Quayle, the GOP candidate running with George HW Bush. “Senator, you are no Jack Kennedy,” Bentsen famously told him. The Republicans won the general election, although that moment was forever linked to Quayle’s career.

In this cycle, when polls show the race is dead, the debate could well matter. Neither Walz nor Vance had much of a national profile before they were both selected as candidates to run, and the pundits were largely left to guess what their impact would be over the course of the evening.