(Bloomberg) -- The Democratic National Committee and CNN unveiled the list of candidates who will take part in the second presidential primary debates of the 2020 election.The debates will take place in Detroit on July 30 and 31 with 10 candidates on each stage. The group participating each night will be selected at random in a live draw on CNN on Thursday. Each night’s slate will be designed to feature a mix of high-polling and low-polling contenders.Below are the candidates who have qualified based on the DNC rules.Joe Biden, former vice presidentCory Booker, U.S. senator from New JerseyPete Buttigieg, South Bend, Indiana, mayorJulian Castro, former secretary of Housing and Urban DevelopmentTulsi Gabbard, U.S. congresswoman from HawaiiKirsten Gillibrand, U.S. senator from New YorkKamala Harris, U.S. senator from CaliforniaJay Inslee, Washington governorAmy Klobuchar, U.S. senator from MinnesotaBeto O’Rourke, former U.S. congressman from TexasBernie Sanders, U.S. senator from VermontElizabeth Warren, U.S. senator from MassachusettsMarianne Williamson, spiritual healerAndrew Yang, entrepreneurMichael Bennet, U.S. senator from ColoradoTim Ryan, U.S. congressman from OhioJohn Hickenlooper, former Colorado governorBill de Blasio, New York City mayorJohn Delaney, former U.S. congressman from MarylandSteve Bullock: Montana governorTo qualify, the DNC required a threshold of at least 1% support in major polls, or 65,000 individual donations from at least 20 states. If more than 20 candidates qualified under at least one criteria, the DNC would decide who to cut.The candidates who won’t make the second debate are Seth Moulton, congressman from Massachusetts and Wayne Messam, mayor of Miramar, Florida. Billionaire activist Tom Steyer and former Pennsylvania Representative Joe Sestak, who recently joined the race, didn’t qualify because they haven’t been included in polls.The contenders have been grouped into three tiers based on polling to ensure that each stage features a mix of top-scoring and lower-scoring candidates. Contenders in each group will be divided evenly over the two nights. The top tier includes Biden, Warren, Sanders and Harris. In the last debate, Warren was the only top-polling candidate on the first night.(Updates with selection procedure in final paragraph)To contact the reporter on this story: Max Berley in Washington at mberley@bloomberg.netTo contact the editors responsible for this story: Joe Sobczyk at jsobczyk@bloomberg.net, Wendy Benjaminson, Max BerleyFor more articles like this, please visit us at bloomberg.com©2019 Bloomberg L.P.