Sen. Bernie SandersBernard (Bernie) SandersDemocratic Socialists of America endorses Sanders for president Trump on 2020 Dems skipping AIPAC: 'I think they're anti-Jewish' The Hill's Morning Report — Washington readies for Mueller end game MORE (I-Vt.) on Monday questioned supporters of President-elect Donald TrumpDonald John TrumpSenate GOP budget ignores Trump, cuts defense Trump says he'll nominate Stephen Moore to Fed White House: ISIS territory in Syria has been 100 percent eliminated MORE, asking why they would vote for “somebody who is lying.”

Sanders and MSNBC’s Chris Hayes spoke with Trump voters in a town hall in Kenosha, Wis., about the 2016 election.

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Asked about Trump’s proposed ban on Muslims entering the U.S., several supporters said Trump just suggests controversial policies for attention and isn’t serious.

Sanders minced no words with his reply.

“Why do you vote for somebody who, in a sense then, is lying?”

Several Trump supporters speaking with Sanders said they would not support a Muslim ban, despite Trump touting it early in his campaign.

“I would never want to see anyone thrown out just because of their beliefs. I mean, that’s awful, no,” one supporter said.

“A lot of what he says is unimplementable rhetoric just to gain attention,” another said.

Sanders said Trump won the election because "there's a lot of pain in this country," especially in the middle class, that he was able to tap into.

"One of the arguments as to why Trump won is the belief that most or many of his supporters are sexists or racists or homophobes," Sanders said. "I happen not to believe that's the case. I think what he did do is he said, 'You know what, there's a lot of pain in this country, people are scared and people are worried.' People are tired of status quo politics. He broke through that."

Throughout Sanders' Democratic primary bid, he denounced income inequality and advocated for economic reform. Sanders backed Hillary ClintonHillary Diane Rodham ClintonDemocratic Socialists of America endorses Sanders for president How to end the Electoral College and elect our next president by popular vote CNN town halls put network at center of Dem primary MORE after she won the Democratic nomination.