Sen. Bernie SandersBernard (Bernie) SandersSenate Dems introduce bill to prevent Trump from using disaster funds to build wall Klobuchar, O'Rourke visit Wisconsin as 2020 race heats up Sherrod Brown pushes for Medicare buy-in proposal in place of 'Medicare for all' MORE (I-Vt.) on Wednesday had a message for the "Bernie-or-bust" voters: vote based on the issues, not "personality."

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"People have got to get beyond personality, and they've got to take a hard look at the issues that impact the lives of middle-class and working-class people," Sanders told ABC News.

"That's what this campaign is really about."

The Vermont senator touted Democratic presidential nominee Hillary ClintonHillary Diane Rodham ClintonFemale Dems see double standard in Klobuchar accusations Klobuchar, O'Rourke visit Wisconsin as 2020 race heats up McCabe's shocking claims prove the bloodless coup rolls on MORE's stances on education, environment and campaign finance, contrasting her views with those of her Republican opponent, Donald TrumpDonald John TrumpMcCabe says he was fired because he 'opened a case against' Trump McCabe: Trump said 'I don't care, I believe Putin' when confronted with US intel on North Korea McCabe: Trump talked to me about his election victory during 'bizarre' job interview MORE.

"I think if you look at the issues — whether it is making public colleges and universities tuition free, dealing agressively with climate change, raising the minimum wage, overturning this disastrous Citizens United Supreme Court decision," Sanders said.

"On all of those issues and many more, Hillary Clinton's positions are far, far, far superior to Donald Trump."

Sanders said he plans to do everything he can to ensure Trump does not become the next president of the U.S.

The Vermont senator has given similar advice to the Democratic nominee in the past.

Earlier this month, Sanders said Clinton needs to "get away from all of this personality stuff" and start talking about the real issues facing the country.

"The American people do not agree with Trump," he said.