Bernie Sanders Bernie SandersKenosha will be a good bellwether in 2020 Biden's fiscal program: What is the likely market impact? McConnell accuses Democrats of sowing division by 'downplaying progress' on election security MORE is calling on Republican presidential front-runner Donald Trump to "tone it down" and said he should go on television and tell his supporters to stop the violence at rallies.

"We've got to put an end to this," the Sanders, who is running for the Democratic presidential nomination, said at a CNN town hall staged in Ohio on Sunday night.

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"Trump has got to get on the TV and tell his supporters that violence in the political process in America is not acceptable. End of discussion."

Sanders expressed horror about a comment Trump made at a rally, when the Republican front-runner promised supporters he'll pay their legal fees if they beat up protesters disrupting his rallies.

And then, in an interview on "Meet the Press" Sunday morning, the billionaire told host Chuck Todd he is going to look into paying the legal fees of the man who threw a punch at an African-American protester leaving the event Wednesday evening in Fayetteville, N.C.

“I've actually instructed my people to look into it, yes," Trump said about the possibility of paying the man's legal fees.

"What that means is that Donald Trump is literally inciting violence with his supporters,” Sanders told the Ohio audience. “He's saying that if you go out and beat somebody up, that's OK, I'll pay the legal fees.

"That is an outrage and I would hope that Mr. Trump tones it down big time and tells his supporters that violence is not acceptable in the American political process."