Hillary Clinton Hillary Diane Rodham ClintonButtigieg stands in as Pence for Harris's debate practice Senate GOP sees early Supreme Court vote as political booster shot Poll: 51 percent of voters want to abolish the electoral college MORE's campaign on Saturday criticized Republican presidential nominee Donald Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE for claiming the election is being rigged.

"Campaigns should be hard-fought and elections hard-won, but what is fundamental about the American electoral system is that it is free, fair and open to the people," Clinton campaign manager Robby Mook said in a statement.

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"Participation in the system—and particularly voting—should be encouraged, not dismissed or undermined because a candidate is afraid he’s going to lose," Mook said.

Mook predicted there will be record turnout for the election "because voters see through Donald Trump’s shameful attempts to undermine an election weeks before it happens."

Trump earlier Saturday accused Clinton's campaign and the media of pushing allegations against him that "may poison the minds of the American voter."

He tweeted that “100% fabricated and made-up charges, pushed strongly by the media and the Clinton Campaign, may poison the minds of the American Voter. FIX!"

“This election is being rigged by the media pushing false and unsubstantiated charges, and outright lies, in order to elect Crooked Hillary!” Trump added a short time later.

Over the course of his campaign, Trump has repeatedly raised the idea that the general election could be rigged. His latest claim comes amid mounting allegations from women who have said Trump groped or kissed them without their consent.