Ten Democratic 2020 presidential candidates are scheduled to gather in Houston for the third Democratic primary debate, hosted by ABC on tomorrow, September 12.

To qualify for the September and October primary debates, candidates must secure 130,000 unique donors and reach 2% in four polls approved by the Democratic National Committee.

The debate will be hosted at Texas Southern University, a historically black college in Houston. It will begin at 8 p.m. ET and run for three hours, until 11 p.m.

In addition to airing live on ABC and on Univision in Spanish, the debate will be livestreamed on Abcnews.com and all ABC apps and on ABC's Facebook Watch, YouTube, and Twitter pages.

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Ten Democratic 2020 presidential candidates have qualified to gather in Houston for the third Democratic primary debate, which ABC is set to host tomorrow, September 12.

The September debate will be the first time all qualifiers will fit on a single stage. Twenty candidates qualified for both the June round of debates hosted by NBC and the July round hosted by CNN, prompting them to be split up between two nights each time.

But the Democratic National Committee set much stricter thresholds for candidates to qualify for the September and October primary debates, requiring contenders to secure 130,000 unique donors and reach 2% support in four DNC-approved polls.

The Democratic primary field is significantly winnowing down as candidates fail to make the debate requirements.

Read more: Democratic primary voters expect Elizabeth Warren to crush the third 2020 Democratic debate, while expectations of Joe Biden have taken a sharp downturn

In the past few weeks, former Gov. John Hickenlooper of Colorado dropped out to run for the US Senate, Gov. Jay Inslee of Washington quit the race to run for a third term as governor, and Rep. Seth Moulton of Massachusetts also left the race to run for reelection.

And more recently, Sen. Kirsten Gillibrand of New York ended her campaign after failing to qualify for the September debate.

Who will be on the stage:

The 10 candidates who qualified will appear onstage tomorrow in the following order from left to right, as determined by their polling averages, with the top-polling candidates in the middle.

The ABC anchor George Stephanopoulos, the "World News Tonight" host David Muir, the ABC News correspondent Linsey Davis, and the Univision anchor Jorge Ramos will moderate the debate, ABC announced.

What time the debate will start:

Tomorrow's debate will be hosted at Texas Southern University, a historically black college in Houston. It will begin at 8 p.m. ET and run for three hours, until 11 p.m., ABC said.

Candidates will have 75 seconds to answer questions and 45 seconds to answer follow-up questions or deliver rebuttals when another candidate mentions them by name.

ABC said candidates would deliver opening statements at the beginning of the debate but would not give closing statements.

How to watch:

The debate will air live on ABC and in Spanish on Univision. The event will also be livestreamed on Abcnews.com and on "Good Morning America" and FiveThirtyEight's websites, and it can be viewed on all ABC mobile, Roku, Apple TV, and Amazon TV apps. ABC will also be streaming the debate on its Facebook Watch, YouTube, and Twitter accounts.