Sen. Bernie SandersBernard (Bernie) SandersMichael Bennet 'encouraged' in possible presidential bid: report House Dems unveil measure to reject anti-Israel boycotts Bannon says an O'Rourke-Harris ticket poses the greatest threat to Trump in 2020 MORE (I-Vt.) on Thursday called President-elect Donald TrumpDonald John TrumpClinton and Ocasio-Cortez joke about Kushner's alleged use of WhatsApp Missouri Gov. declares state of emergency amid severe flooding Swalwell on Hicks testimony: 'She's going to have to tell us who she lied for' in Trump admin MORE a "pathological liar" who "changes his mind every single day."

"What do you do when you have a president-elect, soon to be president, who — and I say this not happily, but I think most people who observe him would agree — is a pathological liar who changes his mind every single day," the former presidential candidate said in an interview with MSNBC.
 
The lawmaker then said that he hopes to see a new political movement of millions of Americans who "actually are following reality."
 
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"I am working very hard on this, and we need the help of the American people obviously ... to build a movement of millions of people who actually are following reality. And that's the challenge. Real change in this country, I am more and more convinced of it, is not going to come from Capitol Hill; it's got to come from grassroots America," he said.
 
 
"I want the truth. I really want to hear why people voted the way they voted. I want to hear why people voted for Donald Trump, what their expectations were, why they didn't vote for Secretary Clinton," he said.
 
"Second of all, I want to bounce off the people their views about what a progressive agenda is," Sanders added, stating that he wants to know if progressive policies are attractive to the working class.
 
Sanders has previously said he would be willing to work with Trump on strengthening the middle class but has remained critical about the president-elect's rhetoric.