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 starts at 9 p.m. ET in New York City. ABC News Digital will live blog throughout the day and evening, pre-debate coverage will air at 8 p.m. on the ABC network and stream on ABC News Live -- followed by the debate itself and post-debate analysis.
Walz will not be in the spin room after the debate, according to the Harris-Walz campaign.
Seven surrogates will spin for him instead, including Sens. Mark Kelly, Amy Klobuchar, Ben Ray Luján; Govs. Jared Polis and JB Pritzker; Rep. Jasmine Crockett and Democratic National Committee Chair Jaime Harrison.
-ABC News’ Isabella Murray
Vance will go to the spin room following his debate with Walz, according to a source familiar with the plan.
He also participated in the spin room after former President Donald Trump's debate against Vice President Kamala Harris in September.
Politico was first to report Vance's plans.
-ABC News’ Hannah Demissie
While campaigning around Petoskey, Michigan, on Monday, Walz said that his "focus" was on Hurricane Helene and its destruction across the southeast, even while "looking forward" to the debate.
To prepare for Tuesday night, Walz used Transportation Secretary Pete Buttigieg as a Vance stand-in, who "surprised everyone by showing up to prep in a cheap red tie instead of camp casual attire," according to a source familiar.
-ABC News' Isabella Murray
Sometimes, vice-presidential debates tend not to matter much and are quickly forgotten.
But tonight’s showdown in New York City could matter more than most given how close the presidential race is at the moment.
Many undecided voters – who could end up deciding the election – will get their first chance to hear at length from the Harris and Trump running mates.
The CBS News debate – where mics will be unmuted and the candidates will have to do their own fact-checking – starts at 9 p.m. ET.
The ABC network will carry the debate live with pre-debate coverage beginning at 8 p.m. ET. ABC News Live will stream pre-debate coverage, the debate and post-debate analysis and ABC News Digital/538 will live blog during the debate with key takeaways afterward.
