Sen. Bernie Sanders Bernie SandersJacobin editor: Primarying Schumer would force him to fight Trump's SCOTUS nominee Trump campaign plays up Biden's skills ahead of Cleveland debate: 'He's actually quite good' Young voters backing Biden by 2:1 margin: poll MORE (I-Vt.) on Sunday touted Hillary Clinton Hillary Diane Rodham ClintonJoe Biden looks to expand election battleground into Trump country Biden leads Trump by 12 points among Catholic voters: poll The Hill's Campaign Report: Biden goes on offense MORE over Donald Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE, saying that, "in a sense," a vote for a third-party candidate is a vote for Trump, the Republican presidential nominee.

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"I think it's that the evidence is overwhelming that the next president of the United States is going to be Hillary Clinton or Donald Trump," Sanders said on ABC's "This Week."

"I think if you're voting for somebody else in the sense of not supporting Clinton because she doesn't live up to all of your specifications or all of your ideas, I think, in a sense, it is a vote for Trump."

Sanders then said voters should look at Libertarian nominee Gary Johnson Gary Earl JohnsonWhat the numbers say about Trump's chances at reelection Presidential race tightens in Minnesota as Trump plows resources into state The Hill's Campaign Report: Biden condemns violence, blames Trump for fomenting it l Bitter Mass. primaries reach the end l Super PAC spending set to explode MORE's record on the environment and the economy.

"It is a very conservative approach, something that I think most of my supporters do not support," Sanders said.

The Vermont senator also urged people to contrast the positions of Trump with those of Clinton, the Democratic nominee, calling on voters to select a candidate based on the issues.

He cited Clinton's positions on climate change, minimum wage and pay equity for women and slammed Trump's positions on these issues.

Sanders has been campaigning for his former Democratic primary rival recently, urging voters to get on board with the Clinton campaign.