Washington –Sen. JD Vance Governor of Ohio and Minnesota. Tim Waltz – both relative newcomers into the national political spotlight – compete on Tuesday in the only scheduled vice president debate before the election in November.

The debate comes three weeks after former President Donald Trump and Vice President Kamala Harris debated their only scheduled debate.

Walzwho is Harris’ running mate, had one long career in politics but was largely unknown to voters outside of Minnesota before joining the Democratic Party.

Vancethe author of “Hillbilly Elegy,” was first elected to office in 2022, less than two years before he was chosen by Trump as his running mate.

Here’s what you should know about the debate.

When does the VP debate begin and end?

The debate begins Tuesday at 9 p.m. ET. It lasts 90 minutes – the same length as the two presidential debates – and ends at 10:30 p.m. ET.

Who moderates the VP debate?

“CBS Evening News” anchor and editor-in-chief Norah O’Donnell and “Face the Nation” anchor and chief foreign affairs correspondent Margaret Brennan will do so moderate the debate.

Where is the VP debate?

The debate takes place in CBS Broadcast Center in the Hell’s Kitchen neighborhood of New York City in Midtown Manhattan.

The debate will take place in Studio 45 in the Broadcast Center. After the debate, campaign officials and the press will go to the spin room in Studio 42, another studio in the 800,000-square-foot Broadcast Center. Members of the media will follow the debate and document their stories from a press pen set up in the cafeteria.

Until this summer, “Inside Edition” was filmed at Studio 45. “Captain Kangaroo” was also recorded at Studio 45 from 1964 to 1981.

CBS News moved into the facility in 1964 and Walter Cronkite broadcast the 1964 election results from Studio 41, now home to The Drew Barrymore Show. Before moving to the CBS Broadcast Center, CBS was located in the Grand Central Terminal building.

The massive studios and sound stages have hosted several soap operas, including “As the World Turns” at Studio 41 and “Guiding Light” at Studio 42. “Last Week Tonight with John Oliver” is currently filming at Studio 42.

In the early 1980s CBS added 176,400 square feet integrated into the 500,000-square-foot building as part of a $100 million modernization.

The CBS Broadcast Center is home to CBS News 24/7, CBS New York (WCBS-TV) and several other corporate and third-party productions. It is also the distribution center of the CBS Television Network.

What are the rules for the debate?

Both campaigns agreed to a 90-minute debate with two four-minute commercial breaks. Campaign staff are not permitted to interact with candidates during breaks.

There will be no audience – a measure that was also implemented at the previous two presidential debates.

At the start of the event, the moderators introduce the candidates in order of incumbent party, with Walz first. There will be no opening statement.

Walz will stand behind the lectern on the left side of the stage, which is located on the right side of the audience screens. Vance will be at the podium on the right side of the stage, but on the left side of the screens.

Candidates who cannot bring pre-written notes or props to the stage will have two minutes to answer a question and two minutes to respond. They are given one minute to rebut. At the discretion of the moderators, candidates may be given an additional minute to continue the discussion.

Unlike presidential debates, a candidate’s microphone will not be muted when his opponent speaks, but CBS News reserves the right to turn off the microphones.

Vance won a virtual coin toss on Thursday and settled for second place with his closing statement. Each candidate has two minutes to make their closing remarks.

No topics or questions are shared with campaigns in advance.

How can you watch the VP debate on cable?

CBS will cover the debate starting at 8 p.m. ET on CBS stations and partners. Find your local station Here.

How to stream the VP debate without cable?

The debate can be streamed on the free CBS News app on your connected TV or smartphone, on Paramount+ and on all platforms where CBS News 24/7 is available, including CBSNews.com and YouTube.

Debate coverage on CBS News 24/7 begins at 4:00 p.m. ET.