Wednesday is the second and final night of the second Democratic presidential debates in Detroit.
The debate will start at 8 p.m. ET and end around 10:30 p.m. ET on CNN.
Wednesday's debate will offer a rematch of former Vice President Joe Biden and California Sen. Kamala Harris, whose clash over race became the most closely watched moment of the first round of debates.
New Jersey Sen. Cory Booker, who has also been critical of the former vice president, will also be on the stage on Wednesday.
Who is debating on July 31:
Colorado Sen. Michael Bennet
Former Vice President Joe Biden
New Jersey Sen. Cory Booker
Former Housing and Urban Development Secretary Julian Castro
New York Mayor Bill de Blasio
Hawaii Rep. Tulsi Gabbard
New York Sen. Kirsten Gillibrand
California Sen. Kamala Harris
Washington Gov. Jay Inslee
Businessman Andrew Yang
For a large part of the Democratic field outside of the top-tier candidates, the pair of debates will be one of the last chances to make an impression on a national audience. The Democratic National Committee raised the threshold to qualify for the fall debates, meaning many of the candidates run the risk of not making the stage in September and October.
How can I watch them?
CNN's Democratic presidential debates will air exclusively on CNN and will stream live in their entirety, without requiring log-in to a cable provider, exclusively to CNN.com 's homepage, across mobile devices via CNN's apps for iOS and Android, and via CNNgo apps for Apple TV, Roku, Amazon Fire, Chromecast and Android TV.
The full debate nights will be available exclusively the day following the airing on demand via cable/satellite systems, on CNNgo (at CNN.com/go on your desktop, smartphone, and tablets, and via CNNgo OTT apps), and CNN mobile apps on iOS and Android.
CNN's live story will capture key moments from each debate, serving as the home for coverage, expert analysis and fact-checking in real-time.
Additionally, customized coverage will roll out across all of CNN's platforms. This will include stories on CNN's flagship Instagram , featuring CNN's political reporters during and following the debates with important takeaways, fact-checking the candidates, and sizing up their place in the polls.
What are the rules for the debates?
Candidates will be given 60 seconds to respond to a moderator-directed question, and 30 seconds for responses and rebuttals.
Colored lights will be used to help the candidates manage their remaining response times: 15 seconds = yellow; 5 seconds = flashing red; no time remaining = solid red.
A candidate attacked by name by another candidate will be given 30 seconds to respond.
There will be no show of hands or one-word, down-the-line questions.
A candidate who consistently interrupts will have his or her time reduced.
Questions posed by the moderators will appear on the bottom of the screen for television viewers.
The debate and debate-related coverage can be viewed in the player below.