Election 2024 updates: Michelle Obama to speak at DNC this week

CBS News on Wednesday said it has invited the 2024 vice presidential nominees to debate.

The network said it provided four dates as options to the campaign. Democrat Tim Walz indicated that he'd agreed to one on Oct. 1.

"See you on October 1, JD," Walz wrote on X.

A Harris campaign official said: "Harris for President has accepted CBS' invitation to a Vice Presidential Candidate Debate on October 1. Governor Walz looks forward to debating JD Vance -- if he shows up."

-Isabella Murray and Hannah Demissie

Trump briefly mentioned two new policies he's proposed in recent weeks: eliminating taxes on tip wages and on Social Security benefits for seniors.

"With your vote, I will end this injustice and I will always protect Social Security and Medicare for our great seniors," he said.

But he did not offer further details of either policy. Some experts have warned his Social Security proposal could hurt the program by cutting down a funding source at a time when it faces solvency issues.

Trump is in North Carolina to deliver remarks on the economy, but his speech so far has not revealed any new or detailed policy positions and instead is focused on bashing Harris on inflation and immigration.

"With four more years of Harris, your finances will never recover, they're never going to recover. Our country will never recover, frankly, more importantly. It will be unrecoverable," he said. "Vote Trump, and your incomes will soar, your savings will grow, young people will be able to afford a home and we will bring back the American dream bigger, better and stronger than ever before."

Trump participated in early voting in Florida's primary election at a polling location near his home in Palm Beach.

"Well, thank you very much, great honor to vote, done a fantastic job here, and we appreciate it," Trump said as he walked out of the polling site.

Asked by reporters what the FBI had told him about the purported hack of his campaign's email, Trump said, "They're looking at it, and they're doing it very professionally."

He then insisted "it looks like it's Iran," while declining to say whether the FBI had told him it was Iran that hacked his campaign.

Trump also dodged questions about falsely accusing the Harris campaign of using AI-altered images to manipulate crowd sizes.

"I can't say what was there, who was there. I can only tell you about ours," he said. "We have the biggest crowds ever in the history of politics. We have crowds that nobody has ever seen before, and we continue to have that. We have a level of enthusiasm that nobody has seen before. They want to make America great again."

-ABC News' Soorin Kim, Lalee Ibssa and Kelsey Walsh