President Trump needs to put up or shut up on voter fraud.

Despite an absence of credible evidence to support him, the new chief executive continues to believe that up to 5 million people illegally cast ballots in the November election and that their votes cost him a majority in the popular vote tally, White House Press Secretary Sean Spicer said today.

“The president does believe that, he has stated that before,” Spicer told reporters at Tuesday’s daily press briefing. “I think he’s stated his concerns of voter fraud and people voting illegally during the campaign and he continues to maintain that belief based on studies and evidence people have presented to him.”

During a meeting with congressional leaders on Monday, Trump reiterated his claim of widespread voter fraud, Spicer acknowledged. Pressed for details on where Trump is getting that information, the spokesman cited a 2012 Pew Research study that found millions of voter registration records are inaccurate or out of date; the researcher who oversaw that study has said it did not find evidence of illegally cast votes.

Spicer had no answer when reporters pressed him on what Trump intends to do about what would be the most explosive electoral scandal in U.S. history.

On Capitol Hill, Sen. Lindsey Graham, R-SC, urged Trump to find something else to talk about. “I am begging the President, share with us the information you have about this or please stop saying it,” Graham said.

“As a matter of fact, I’d like you do more than stop saying it, I’d like you to come forward and say, ‘Having looked at it, I am confident the election was fair and accurate and people who voted voted legally,’” Graham added “Cause if he doesn’t do that, this is going to undermine his ability to govern this country.”