Former President Donald Trump and Vice President Kamala Harris face off Tuesday night in their first debate of the 2024 election, moderated by ABC News.

With just weeks to go until Election Day, the debate is a key opportunity for both candidates to win over undecided voters in what is expected to be a close race in November.

The debate is a chance for Harris, who became the Democratic nominee after President Joe Biden dropped out of the race following his lackluster debate performance in June, and Trump to lay out their policies on key issues. It will be the first time the two have met in person.

Here’s what you need to know about the debate and how to listen in.

How to watch or live stream the debate

There are several ways to watch the ABC News presidential debate. The debate is produced in partnership with ABC-owned Philadelphia news station WPVI-TV.

It will air on ABC and stream on ABC News Live, Disney+ and Hulu. ABC News Live is available on Samsung TV+, The Roku Channel, Amazon Fire TV devices, YouTube, Tubi and most other streaming platforms. Viewers can also stream the debate on the ABC app on a smartphone or tablet, on ABC.com and connected devices.

Additionally, SiriusXM users can listen to the debate on channel 370.

ABC News Digital and 538 will blog live on the latest news during the debate, providing analysis, fact-checking and reporting on the evening’s key takeaways.

When and where is the presidential debate?

The debate will take place in Philadelphia at the National Constitution Center on Tuesday, September 10 at 9 p.m. EDT.

Who is the moderator of the ABC News presidential debate?

David Muir, host and editor in chief of “World News Tonight,” and Linsey Davis, host of ABC News Live’s “Prime,” will serve as moderators.

The primetime pre-debate special, “Race for the White House,” will be hosted by chief global affairs correspondent and “This Week” co-anchor Martha Raddatz, chief Washington correspondent and “This Week” co-anchor Jonathan Karl, chief White House correspondent Mary Bruce and senior congressional correspondent Rachel Scott. It will air at 8 p.m. EDT and stream on ABC’s platforms.

What are the basic rules?

Both Harris and Trump agreed to the debate rules, which include muting their microphones when the time belongs to another candidate.

The agreed rules include:

• The debate will last 90 minutes, with two commercial breaks.
• The two seated moderators are the only ones who ask questions.
• On Tuesday, September 3, a virtual coin toss was held to determine podium placement and the order of closing statements; former President Donald Trump won the coin toss and chose the order of statements. The former President will deliver the final closing statement, and Vice President Harris will choose the correct podium position on the screen (stage left).
• Candidates are proposed by the moderators.
• The candidates are introduced on either side of the stage, with the incumbent party being introduced first.
• No opening statements; closing statements will last two minutes per candidate.
• Candidates stand behind a podium during the debate.
• Props and pre-written notes are not allowed on stage.
• No topics or questions are shared with campaigns or candidates in advance.
• Candidates will be given a pen, a notepad and a bottle of water.
• Candidates are given two minutes to answer questions, two minutes to rebut, and one additional minute to respond, clarify or react.
• Candidates’ microphones are only active for the candidate whose turn it is to speak. If the time is allocated to another candidate, they are muted.
• Candidates are not allowed to ask each other questions.
• Campaign workers are not allowed to communicate with candidates during commercial breaks.
• Moderators will endeavor to enforce timing agreements and ensure civil discussion.
• There will be no audience in the room.