The White House has dismissed US President-elect Donald Trump’s allegation of fraud in November 8 presidential election.

Republican Trump said in a Twitter post on Sunday that “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.”

“Serious voter fraud in Virginia, New Hampshire and California — so why isn’t the media reporting on this? Serious bias – big problem!” he followed up later.

White House spokesman Josh Earnest said on Monday that there was no evidence of fraud, rejecting them as unsubstantiated. “What I can say, as an objective fact, is that there has been no evidence produced to substantiate a claim like that,” Earnest said.

This comes after Green Party nominee Jill requested a recount in the battleground state of Wisconsin, which Trump’s Democratic rival Hillary Clinton narrowly lost in the election. Along with Michigan and Pennsylvania, Wisconsin played a key role on Election Day in giving Trump victor.

Clinton’s campaign said that it would take part in a recount in Wisconsin and then later on in the other two states. Meanwhile, experts and elected officials on both sides of the political aisle on Monday rejected Trump’s claim . “I have not seen anything in the millions, I don’t know what he was talking about,” Republican Senator James Lankford told CNN.

Also, Bernie Sanders, former rival of Clinton, called Trump’s remarks “unfounded nonsense” that indicated Republicans sought to make it more difficult for people including minorities to register to vote. In New Hampshire, the deputy secretary of state, David Scanlan, said isolated instances of voter fraud “show up in every election” but added that the 2016 ballot had run “very smoothly.” California’s top election official, Alex Padilla, said Trump’s “unsubstantiated allegations of voter fraud in California and elsewhere are absurd.”

Presstv