Sen. Bernie SandersBernard (Bernie) SandersBernie Sanders to sign pledge affirming he will run as a Democrat Overnight Health Care — Presented by National Taxpayers Union — Drug pricing fight centers on insulin | Florida governor working with Trump to import cheaper drugs | Dems blast proposed ObamaCare changes Hillicon Valley: Microsoft reveals new Russian hack attempts | Google failed to disclose hidden microphone | Booker makes late HQ2 bid | Conservative group targets Ocasio-Cortez over Amazon MORE (I-Vt.) on Sunday said the percentage of popular support candidates need to participate in the presidential debates should "probably" be lower than what it is now.

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"Probably too high," Sanders, who challenged Hillary ClintonHillary Diane Rodham ClintonFBI’s top lawyer believed Hillary Clinton should face charges, but was talked out of it Harris adds key Clinton aide, women of color to 2020 campaign: report Democrats more likely Trump's foil, than to foil Trump MORE for the Democratic nomination, said on NBC's "Meet the Press" when asked whether he thinks that threshold is fair.

Libertarian nominee Gary JohnsonGary Earl JohnsonPotential GOP primary challenger: Trump's 'contempt for the American people' behind possible bid The Hill's 12:30 Report — Presented by Kidney Care Partners — Trump escalates border fight with emergency declaration Former Mass. governor takes step toward Trump primary challenge MORE and Green Party nominee Jill Stein have been making a case for why they should be allowed to take part in the presidential debates.

To participate, a candidate needs to hit an average of 15 percent in polls conducted by ABC/Washington Post, CBS/New York Times, CNN/Opinion Research Corporation, Fox News and NBC/Wall Street Journal.

Stein said Sunday morning that the American people have a right to vote and to know for whom they can vote. 

A recent poll by Morning Consult showed that a majority of voters say Johnson should take part in the presidential debates. Nearly 50 percent say the same of Stein.

But neither candidate appears to be polling high enough at this point to participate in the presidential debates.

According to the RealClearPolitics average of polls, Johnson is polling at 7.8 percent and Stein at 3.1 percent.