President Obama delivered a blunt response on Tuesday to Donald Trump’s ongoing, unsubstantiated complaints that the November election will be rigged against him: quit whining, and go win votes.

A reporter asked the President about Trump’s repeated assertions of a “rigged” election and widespread voter fraud at a Rose Garden news conference with the prime minister of Italy.

“That is both irresponsible and by the way doesn’t show the kind of leadership and toughness you want out of a president. You start whining before the game is even over?” President Obama asked sarcastically. “If whenever things are going badly for you and you lose, you start blaming somebody else then you don’t have what it takes to be in this job.”

The President also dismissed Trump’s comments as both unprecedented and “based on no facts.”

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He pointed out that elections are conducted at a state level, and many of the most actively contested states, like Florida, Ohio and North Carolina have Republican governors who’d be unlikely to collude with Hillary Clinton against a Republican candidate.

“Every expert, regardless of political party, regardless of ideology, conservative or liberal who has ever examined these issues in a serious way will tell you that instances of significant voter fraud are not to be found,” the President said.

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At an afternoon rally in Colorado, Trump did not respond to the President directly, but kept up his line of accusations about the media and an unknown, conspiratorial “they” working to rig elections against him.

“They even want to rig the election at the polling booths, where so many cities are corrupt. And you see that. And voter fraud is all too common,” Trump said. “And then they criticize us for saying that.“