Donald Trump’s spokesman on Tuesday doubled down on the president’s claims that more than 3 million people voted illegally on Election Day — a claim that has been thoroughly debunked.

Spokesman Sean Spicer repeatedly declined to provide any evidence of what would have been the most egregious case of voter fraud in US history — and would not explain why Trump hasn’t ordered an investigation if that’s what he believes.

“The president does believe that, I think he’s stated that before and stated his concern of voter fraud and people voting illegally during the campaign and continues to maintain that belief based on studies and evidence people have brought to him,” Spicer said.

Trump’s press secretary refused to describe the “studies” or “evidence” he said the president was relying on.

House Speaker Paul Ryan has debunked the claim, as have numerous media outlets.