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 called 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 a "demagogue" who is campaigning on pure bigotry.

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"My opposition to Trump goes beyond the fact that he refuses to recognize the reality of climate change," the Vermont Senator said at a rally in Lebanon, N.H. on Monday.

"It goes beyond his willingness to give tax breaks to billionaires and cut programs for working people.

"My opposition in the strongest way to Trump is that he is making the cornerstone of his campaign, not economics, not healthcare, not the environment … the essence of his campaign is bigotry."

Sanders launched his attack on Trump's character during his first day of campaigning on behalf of his former rival, 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.

Sanders accused Trump of "trying to divide this country up" and telling Americans that they are supposed to hate Muslims, Mexicans and women.

"We're supposed to hate anybody who is different than we are," Sanders said of Trump's message.

The former Democratic candidate said that as the son of immigrants his own message is that, "We are strongest when in fact we bring our people together."