Former Arkansas Gov. Mike Huckabee (R) on Tuesday said he hasn't seen any evidence to support President Trump's claim of widespread voter fraud.

"I have no evidence whatsoever, and I don't know that anyone does, that there were that many illegal people who voted, and frankly it doesn't matter," Huckabee, a longtime Trump backer, told Fox Business.

"He's the president, and whether 20 million people voted, it doesn't matter anymore. He's the president, and I'm not sure why he brought it up."

Trump told congressional leaders at a reception at the White House that he would have won the popular vote if not for millions of illegal votes, sources told The Hill on Monday.

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He said between 3 million and 5 million illegal votes resulted in him losing the popular vote.

Democrat Hillary Clinton Hillary Diane Rodham ClintonHillicon Valley: FBI chief says Russia is trying to interfere in election to undermine Biden | Treasury Dept. sanctions Iranian government-backed hackers The Hill's Campaign Report: Arizona shifts towards Biden | Biden prepares for drive-in town hall | New Biden ad targets Latino voters FBI chief says Russia is trying to interfere in election to undermine Biden MORE won the popular vote by more than 2.8 million votes, but Trump won the Electoral College.

The president made similar claims in tweets he posted after his victory.

"In addition to winning the Electoral College in a landslide, I won the popular vote if you deduct the millions of people who voted illegally," he tweeted after Election Day.

During the presidential campaign, Trump frequently charged that the election was rigged and alleged widespread voter fraud.