Here's the lineup for the first 2020 Democratic presidential debates taking place later this month

Democratic presidential candidates have to meet certain polling and donation thresholds in order to secure a spot on the debate stage this summer.

The maximum number of candidates that can qualify is 20, after which the field will be narrowed by the Democratic National Committee in the event too many candidates qualify.

Sen. Michael Bennet of Colorado became the 20th candidate to qualify.

The DNC is also deciding which polls are considered legitimate and which are not, angering candidates upset by the process who are at risk of being excluded.

The DNC announced the official lineup of candidates in the debate on June 13.

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Rules set forth by the Democratic National Committee have created a threshold for 2020 presidential candidates looking to get a spot on stage at the first set of primary debates taking place later this month in Miami.

Candidates must meet one of two different minimums at least two weeks before the first debate:

Receive campaign contributions from at least 65,000 different individuals.

Achieve 1% in three separate polls from news and polling organizations approved by the DNC.

In the event more than 20 Democrats meet either of the required minimums, the DNC said it would narrow the field using a combination of the two thresholds.

Read more: A little-known Democrat who has been running for president for almost 2 years is trying a wild scheme to try and get enough donations to qualify for the presidential debates

Sen. Michael Bennet of Colorado became the 20th candidate to qualify. But Montana Gov. Steve Bullock, who previously could have qualified, no longer has a secured spot on stage.

According to Politico, the DNC said Bullock's qualifying Washington Post/ABC News poll does not count, putting him on the outside and New York City Mayor Bill de Blasio on the insider. The deadline for Bullock and all candidates who haven't yet qualified to do so was June 12.

On June 13, the DNC released the official list of candidates who will participate in the debates. The debates will be held on June 26-27, and a random drawing will assign 10 candidates to each night.

In a crowded field of candidates, the hurdles proved to be a lot more difficult; candidates are scrambling for donations and developing new and unique strategies to boost their campaign contributions.