To appear in the party’s third debate, which will be broadcast by ABC News and Univision, candidates will have to earn 2 percent support in four party-sanctioned polls between late June and August. In addition, they will have to show they’ve attracted at least 130,000 donors since the start of the campaign, including at least 400 from 20 different states.

That third debate will be held on Sept. 12, with the possibility of a second session on Sept. 13 if there are enough qualifying candidates to require two stages.

As the race now stands, only eight candidates in the field would meet the 2 percent threshold in recent party-sanctioned polls, according to an assessment by FiveThirtyEight, a data analysis website. Many are also struggling to reach the donor requirements.