Sen. Bernie SandersBernie SandersHere are the potential candidates still eyeing 2020 bids Sanders unveils education plan that would ban for-profit charter schools Warren policy ideas show signs of paying off MORE (I-Vt.) on Monday questioned supporters of President-elect Donald TrumpDonald John TrumpTrump calls for Republicans to be 'united' on abortion Tlaib calls on Amash to join impeachment resolution Facebook temporarily suspended conservative commentator Candace Owens 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 ClintonWarren policy ideas show signs of paying off Biden at campaign kickoff event: I don't have to be 'angry' to win Top Dem: Trump helps GOP erase enthusiasm gap; Ohio a big problem MORE after she won the Democratic nomination.