The White House says there is no evidence to support Donald Trump's claim of widespread voter fraud in the 2016 US presidential election.
Press Secretary Josh Earnest dismissed the president-elect's unsubstantiated allegations that millions of people had cast illegal votes.
Mr Trump also alleged voter fraud in Virginia, New Hampshire and California, states which Hillary Clinton won.
Mr Earnest deferred to Mr Trump's team for further comment.
"What I can say, as an objective fact, is that there has been no evidence produced to substantiate a claim like that," he told reporters at a White House briefing.
Mr Trump, who won the all-important electoral college count, aired his grievances with the election result in a tweet on Sunday.
"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 wrote.