MIAMI, United States, June 26 (Xinhua) -- Ten Democratic contenders for the 2020 U.S. presidency took the stage here on Wednesday night for the party's first primary debate, a two-night event scheduled to be attended by 10 others on Thursday.

Senator Elizabeth Warren of Massachusetts, former Texas congressman Beto O'Rourke, and Senator Cory Booker of New Jersey are among the first group of participants who have garnered the most support in polls.

They are joined by Senator Amy Klobuchar of Minnesota, New York Mayor Bill de Blasio, San Antonio ex-mayor Julian Castro, former Maryland congressman John Delaney, Washington Governor Jay Inslee, Hawaii congresswoman Tulsi Gabbard, and Ohio congressman Tim Ryan.

According to new debate rules, each candidate will have 60 seconds to answer questions asked by moderators and 30 seconds for rebuttals.

There are no opening statements, but each candidate will have one minute for a closing statement.