The Democratic presidential debate is 9 p.m. to 11 p.m. Eastern time. It is being held in Las Vegas and hosted by NBC, MSNBC and The Nevada Independent.

The debate is taking place three days before the Nevada caucuses on Saturday.

This is the first debate to include former Mayor Michael R. Bloomberg of New York. He will join five other Democratic candidates: Senator Bernie Sanders of Vermont; former Vice President Joseph R. Biden Jr.; Senator Elizabeth Warren of Massachusetts; former Mayor Pete Buttigieg of South Bend, Ind.; and Senator Amy Klobuchar of Minnesota.

In the two nominating contests so far, Mr. Buttigieg and Mr. Sanders were essentially tied in Iowa, and Mr. Sanders narrowly beat Mr. Buttigieg in New Hampshire. Going into tonight’s debate, polling indicates Mr. Sanders has an edge over his rivals in Nevada.

Candidates will have one minute and 15 seconds for answers, and 45 seconds for follow-up responses at the moderators’ discretion. The moderators are Lester Holt and Chuck Todd of NBC, Hallie Jackson of NBC and MSNBC, Vanessa Hauc of Noticias Telemundo and Jon Ralston of The Nevada Independent.

The New York Times will have extensive debate coverage, including a live analysis throughout the event.