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.) says Republican primary front-runner 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 is “pathologically lying” about the claim that thousands of Muslims in America were celebrating after the 9/11 terrorist attack.

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“Nobody has seen a tape of thousands of people celebrating the destruction of the Twin Towers in New Jersey. It doesn’t exist. And he keeps claiming it. That’s called pathological lying,” the White House hopeful said on ABC’s “This Week” on Sunday.

Earlier in the show, Trump said in an interview that Sanders had lied during Saturday’s Democratic debate.

“Yet he just a few moments ago accused me of lying. What I said last night is that he has suggested that Mexicans who are coming to this country are criminals and rapists. That is exactly what he said,” Sanders said.

Sanders, a Democratic primary candidate, accused Trump of “playing on the fears and anxieties of the American people.”

“But what Trump says — and this isn’t new, this is what demagogues all over the world historically have done — is say, ‘Are you nervous? Are you scared? Are you frightened for the future? I’ll tell you the reason. It’s the Muslims,’ ” Sanders said, imitating Trump.

“ ‘All those Muslims out there are terrorists. We have to stop them coming into this country. It’s the Mexicans. It’s the immigrants who are coming in. They’re all rapists and criminals,’ ” he continued.

Sanders said Trump’s celebrity candidacy is preventing Americans from having a rational debate about important policy proposals.