The White House said Monday “there has been no evidence produced to substantiate” President-elect Donald Trump’s claims alleging that the real estate mogul would have won the most popular votes “if you deduct the millions of people who voted illegally.”

On Sunday, Trump also alleged voter fraud in Virginia, New Hampshire and California, states which he lost to his Democratic rival Hillary Clinton. He, however, offered no evidence backing his claims.

White House Press Secretary Josh Earnest dismissed Trump’s allegations reportedly saying: “I think I would defer to the president-elect’s team for commentary on his tweets. I think what I can say is an objective fact, is that there has been no evidence produced to substantiate a claim like that. But for a reaction and explanation I would refer you to the president-elect.”

The real estate mogul’s Twitter outburst followed a recount petition filed by former Green Party presidential nominee Jill Stein in Wisconsin, alleging that hackers manipulated the election results in favor of a Trump win. Her campaign said similar petitions will be filed in Michigan and Pennsylvania.

The Clinton campaign broke its silence on the issue Sunday when the campaign’s general counsel Marc Elias wrote on Medium that the campaign had not found any evidence supporting Stein’s claims but will participate in the recount.

“Because we had not uncovered any actionable evidence of hacking or outside attempts to alter the voting technology, we had not planned to exercise this option ourselves, but now that a recount has been initiated in Wisconsin, we intend to participate in order to ensure the process proceeds in a manner that is fair to all sides,” Elias wrote. “If Jill Stein follows through as she has promised and pursues recounts in Pennsylvania and Michigan, we will take the same approach in those states as well.”

Former presidential candidate Sen. Bernie Sanders said Sunday the recount effort is “not a big deal,” adding nobody expected significant changes at the end of the recount.