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 on Thursday revived his unfounded claim that there is widespread voter fraud in the United States.

Speaking at a roundtable on tax reform in White Sulphur Springs, West Virginia, Trump told attendees that Americans in California cast ballots “many times.”

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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,’” Trump 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 previously said, without evidence, that there is massive voter fraud in the U.S. Trump has also claimed, without presenting any proof, that he would have won the popular vote in 2016 if not for illegal ballots.

Trump in January disbanded a controversial commission meant to investigate his claims of voter fraud during the 2016 election, after the panel had been plagued with lawsuits and state refusals to agree to the commission's requests.