The matchup could have an impact on critical undecided voters.
The vice-presidential debate between Tim Walz and JD Vance could prove to be a major factor in the presidential election -- given how close the race is and its potential impact with undecided voters.
The 90-minute CBS News showdown started at 9 p.m. ET in New York City. ABC News Digital will live blog throughout the debate. Stay with ABC News for post-debate analysis on air and online.
President Joe Biden sent well-wishes to Walz in a post on X from his campaign account on Tuesday night ahead of the CBS News vice presidential debate.
"Coach, I got your back tonight! Tonight, America will see the strong, principled, and effective leader I've known for years—and the contrast you and Kamala provide against the other team," Biden wrote.
-ABC News' Oren Oppenheim
Rep. Elise Stefanik, R-N.Y., surrogating for Vance, predicted that Iran's attacks Tuesday on Israel could be a part of the debate questions, saying the latest development in the Middle East has raised the stakes of the importance of national security issues.
"I think that as the American people are seeing the unprecedented hypersonic ballistic missile attack directly from Iran launched into multiple quantities, that raises the stakes," she said in the spin room. "It also provides an opportunity for JD Vance to compare the peace through strength, and the peace, specifically in the Middle East under President Trump, versus this catastrophe that we're seeing around the world."
-ABC News' Soo Rin Kim
Vice President Harris, in a fundraising pitch email to supporters, said Walz "is ready" to debate Vance.
"In just hours, Tim Walz will debate JD Vance," she wrote. "I know that he is ready. And it would help if he knew donors like you had his back before he got on stage."
Harris added that "Tim has been an outstanding partner out on the campaign trail over the last two months," and "I have the utmost confidence in the team we've built."
-ABC News' Fritz Farrow
White House press secretary Karine Jean-Pierre wouldn't say during the White House press briefing on Tuesday whether President Joe Biden would watch the vice presidential debate, but she said the president has "complete confidence" in Walz.
"He continues to be very busy with all of the events happening today," she said during Tuesday's briefing. "But he has complete confidence in Tim Walz."
