Bill Clinton William (Bill) Jefferson ClintonGOP brushes back charges of hypocrisy in Supreme Court fight Battle lines drawn on precedent in Supreme Court fight Sunday shows - Ruth Bader Ginsburg's death dominates MORE said Monday that Republican attacks on his family's foundation were "funny" and likened his actions as head of the organization to Robin Hood's.

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"They even went after my foundation last week. Now that was really funny," the former president told a crowd at the AFL-CIO's picnic in Cincinnati, Ohio, on Labor Day.

"I was sort of Robin Hood, except I didn't rob anybody," Clinton said. "I just asked people with money to give it to people who didn't have money."

Republicans have accused the Clinton Foundation of running a "pay-to-play" scheme, following the release of private emails showing cozy relationships between top foundation officials and the State Department during Hillary Clinton Hillary Diane Rodham ClintonJoe Biden looks to expand election battleground into Trump country Biden leads Trump by 12 points among Catholic voters: poll The Hill's Campaign Report: Biden goes on offense MORE's tenure as secretary of State from 2009-13.

But no evidence has emerged that prove Clinton took actions as secretary of State as a result of donations to her family's foundation.

The Trump campaign swiftly attacked Bill Clinton over his comments Monday, saying it saw no humor in the allegations surrounding the foundation.

“There’s nothing funny about the growing evidence of corruption and conflicts of interest between the Clinton Foundation and Hillary Clinton’s State Department," Trump's senior communications adviser Jason Miller said in an emailed statement.

"The fact that a Hillary Clinton presidency would be compromised by tens of millions of dollars in foreign donations to the Clinton Foundation is no laughing matter either – it is downright terrifying.

Bill Clinton has promised that if Clinton wins the presidency, the foundation will stop taking foreign and corporate donations.

But, as The Hill has revealed, there remain many loopholes that would allow foreign money to enter the organization relatively easily.

"When that 3 a.m. phone call comes, we can’t have an ethically-challenged president on the line who took truckloads of cash from other countries," Miller said.