Former Democratic presidential candidate Bernie SandersBernie SandersWTO faces renewed scrutiny amid omicron threat Overnight Health Care — Presented by March of Dimes — Abortion access for 65M women at stake Hospitals in underserved communities face huge cuts in reckless 'Build Back Better' plan MORE on Sunday discouraged voters from picking a third-party nominee, saying the issues facing the U.S. are too dire for a "protest vote." 

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"This moment in history for a presidential election is not the time for a protest vote," the Vermont senator said on CBS's "Face the Nation." 

"It's time to look at which candidate will work best for the middle class and working families." 

He said he didn't want to disparage third-party candidates, but he encouraged voters to pick Democratic presidential nominee Hillary ClintonHillary Diane Rodham ClintonRepublican Ohio Senate candidate slams JD Vance over previous Trump comments Budowsky: Why GOP donors flock to Manchin and Sinema Countering the ongoing Republican delusion MORE over Republican nominee Donald TrumpDonald TrumpBiden heading to Kansas City to promote infrastructure package Trump calls Milley a 'f---ing idiot' over Afghanistan withdrawal First rally for far-right French candidate Zemmour prompts protests, violence MORE

Libertarian presidential nominee Gary JohnsonGary Earl JohnsonBiden broadened Democratic base, cut into Trump coalition: study New Mexico lawmakers send recreational marijuana bills to governor Judge throws out murder convictions, releases men jailed for 24 years MORE has hoped to benefit from record low favorability numbers for Clinton and Trump. But a RealClearPolitics polling average only gives him 8.9 percent support nationally.