Gov. Tim Walz, D-Minn., went on offense over immigration in the CBS News vice presidential debate, blaming former President Donald Trump for supposedly killing a bipartisan immigration bill.

"We had the fairest and the toughest bill on immigration that this nation's seen," he said. "It was crafted by a conservative senator from Oklahoma, James Lankford. I know him. He's super conservative, but he's a man of principle. Once you get it done. Democrats and Republicans worked on this piece of legislation. The Border Patrol said, 'This is what we need in here.'"

"These are the experts, and the Chamber of Commerce and the Wall Street Journal said, pass this thing. Kamala Harris helped get there 1500 new border agents, detection for drugs," he went on. "DOJ money to speed up these. The adjudications on this, just what America wants. But as soon as I was getting ready to pass and actually tackle this, Donald Trump said no. Told them to vote against it, because it gives him a campaign issue."

Vance retorted that it was Harris's apathy as the border czar and the Biden administration's repeal of Trump-era executive orders that caused the crisis.

"Look, I think what Tim said just doesn't pass the smell test. For three years, Kamala Harris bragging that she was going to undo Donald Trump's border policy," he said. "She did exactly that. We had a record number of illegal crossings. We had a record number of fentanyl coming into our country."

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Sen. JD Vance, R-Ohio, on Tuesday excoriated the Biden-Harris administration's policy toward Iran in the opening row of the vice presidential debate, blaming the White House for funding the Iranian military's operations through sanctions relief.

"Iran, which launched this attack, has received over $100 billion in unfrozen assets thanks to the Kamala Harris administration," Vance said. "What do they use that money for? They use it to buy weapons that they're now launching against our allies and, God forbid, potentially launching against the United States as well."

Walz, for his part, retorted that Trump had withdrawn the U.S. from the Iran nuclear deal and that "Iran is closer to a nuclear weapon than they were before because of Donald Trump's fickle leadership."

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Sen. JD Vance, R-Ohio, and Gov. Tim Walz, D-Minn., have taken the stage in the CBS News vice presidential debate.

The pair are facing off in New York City at the network's broadcast center. The 90-minute contest will not feature opening statements and neither candidate's microphone will be muted when the other is speaking.

The contest is set to be their only face-off of the 2024 election cycle and follows former President Donald Trump's debate with Vice President Kamala Harris on ABC News last month.