The White House on Monday dismissed President-elect Donald Trump's unsubstantiated claim of widespread voter fraud in the 2016 presidential election.

"There has been no evidence produced to substantiate a claim like that," White House press secretary Josh Earnest told reporters.

Earnest refused to comment further on Trump's allegations.

"I would defer to the president-elects team for commentary on his tweets," he said.

Trump on Sunday claimed, without citing evidence, that millions of people voted illegally for Democratic nominee Hillary Clinton and that he would have won the popular vote if their ballots were not counted.