NEW YORK — A sitting US governor and a congressman will be among the four candidates left off the stage when the Democratic Party holds its pivotal first debate in Miami later this month.

The Democratic National Committee announced on Thursday the list of 20 presidential candidates who qualified to participate in the debate.

The decision deals a blow to the candidates who will be omitted: Montana Governor Steve Bullock, US Representative Seth Moulton of Massachusetts, former US Senator Mike Gravel, and Wayne Messam, the mayor of Miramar, Florida.

The debates, held over two nights on June 26 and June 27, will offer a sprawling Democratic field its first close-up with Americans and allow candidates who have trailed in opinion polls the opportunity for a poll-boosting viral moment.

The 20 qualifying candidates will be randomly divided between the two nights in a way that ensures top-polling candidates will be spread evenly between both debates. The drawing is expected to take place on Friday in New York.

Candidates qualified for the debates by receiving at least 1% in three polls, or by receiving donations from 65,000 supporters, including at least 200 donors apiece in 20 states.

In most years, the list of candidates to participate in a presidential debate would not garner much attention. But the historically large field of 24 candidates forced the Democratic Party to establish rules to limit participation and make the debates less unwieldy — and forced a mad dash from bottom-tier candidates to meet the requirements.

Bullock has been the most vocal critic of the system. He was the final candidate to enter the race after formally launching his presidential campaign in May.

He waited until after Montana's legislature completed its session. But that gave him less time to build support in the polls or raise money.

"I had a job to do, and if it ultimately ever came down to choosing between getting Medicare reauthorized, getting 100,000 Montanans healthcare versus getting in earlier just to try to bump up on yet another poll, I'd make that same choice time and time again," Bullock said on MSNBC after the list was finalized.

The debate will be broadcast in prime time on NBC, MSNBC, and Telemundo and be streamed online for free on a variety of digital and social platforms.

Here are the participants:

* Senator Michael Bennet of Colorado

* Former Vice President Joe Biden

* Senator Cory Booker of New Jersey

* South Bend, Indiana, Mayor Pete Buttigieg

* Former Housing Secretary Julián Castro

* New York Mayor Bill de Blasio

* Former Representative John Delaney of Maryland

* Representative Tulsi Gabbard of Hawaii

* Senator Kirsten Gillibrand of New York

* Senator Kamala Harris of California

* Former Governor John Hickenlooper of Colorado

* Governor Jay Inslee of Washington

* Senator Amy Klobuchar of Minnesota

* Former Representative Beto O'Rourke of Texas

* Representative Tim Ryan of Ohio

* Senator Bernie Sanders of Vermont

* Representative Eric Swalwell of California

* Senator Elizabeth Warren of Massachusetts

* Author Marianne Williamson

* Entrepreneur Andrew Yang. — Reuters