The next debate featuring 20 of the two dozen Democrats seeking the 2020 presidential nomination is coming up at the end of the month, and CNN has announced some changes from the previous format.

As in the first round in Miami, the debate in Detroit will be divided into two nights to accommodate the large field of candidates: the first on July 30, the second on July 31.

Both will air at 8 p.m. EDT and will run two hours. CNN chief political correspondent Dana Bash will join hosts Don Lemon and Jake Tapper as moderators.

Out of the 24 candidates in the field, the 20 candidates to take the stage will be selected by polling and fundraising criteria set by the Democratic National Committee. Who made the cut will be announced July 17.

Of those 20, CNN will randomly determine which candidates appear on which debate night in a live drawing scheduled July 18.

In the debate in Miami hosted by NBC News and Telemundo, each candidate was given time for a closing statement. But in Detroit, CNN said each of them will be allowed an opening statement as well.

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Another big change is that candidates who interrupt "consistently" will be penalized and have time taken away from them, though CNN did not specify how it defines the level of interruption that would trigger the penalty nor how much time would be deducted.

In Miami, the candidates often tried to interject when another person was speaking, including some tense sparring between former Housing and Urban Development Secretary Julián Castro and former Rep, Beto O'Rourke over immigration and a moment when author Marianne Williamson cut into Rep. Eric Swalwell's "pass the torch" remarks to talk about the space race.

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Sen. Kamala Harris made the most of the interruptions, telling her fellow candidates amid one free-for-all that "America does not want to witness a food fight. They want to know how we're going to put food on their table." And she was lauded for two moments when she interrupted to challenge former Vice President Joe Biden on racial discrimination.

In Miami, NBC News moderator Chuck Todd was widely criticized for having the candidates give one-word answers or just raise their hands in response to complex policy issues. CNN announced there will be no such "down-the-line questions."

Here's a rundown of some of the other rules:

Each candidate gets 60 seconds to answer a moderator's question and 30 seconds for responses or rebuttals if attacked by another candidate.

Colored lights will be used to show the candidates how much time they have, with yellow indicating 15 seconds, flashing red indicating 5 seconds and solid red meaning their time is up.

Questions asked by the moderators will appear at the bottom of viewers' screens.

Another change, though not one determined by CNN, is that Rep. Eric Swalwell will not be in the running to join the candidates on the debate stage after the California Democrat dropped out of the race on Monday. But the next day, billionaire and activist Tom Steyer announced he was jumping into the race, keeping the number of Democratic hopefuls at 24.

Steyer will face an uphill battle in making the debate stage in July.

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