The American Civil Liberties Union (ACLU) on Thursday blasted President Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE for reviving an unfounded claim about widespread voter fraud in the U.S.

The ACLU tweeted that Trump is "peddling lies" to "delegitimize" democracy with his claim, which he presented without evidence.

Once again @realDonaldTrump is claiming — without proof — that millions of people vote illegally in our elections.



The real conspiracy is elected officials peddling lies in order to delegitimize our democracy and justify restrictions on the right to vote. https://t.co/eT2lNxooWk — ACLU (@ACLU) April 5, 2018

During a tax-reform roundtable in West Virginia earlier in the day, Trump brought back his unfounded claim that "millions" of people vote illegally.

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“In many places, like California, the same person votes many times. You probably heard about that. They always like to say ‘oh that’s a conspiracy theory,’” he said.

“Not a conspiracy theory, folks. Millions and millions of people. And it’s very hard because the state guards their records. They don’t want to see it.”

Trump has claimed in the past that he would have won the popular vote, not Democratic nominee Hillary Clinton Hillary Diane Rodham ClintonJoe Biden looks to expand election battleground into Trump country Biden leads Trump by 12 points among Catholic voters: poll The Hill's Campaign Report: Biden goes on offense MORE, in the 2016 presidential election if it were not for illegal ballots.

He shut down a commission designed to probe his claims in January after the task force was slammed with lawsuits and state refusals to agree to the panel's requests.