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On Monday, President Obama met with the two wealthiest Americans, Warren Buffett and Bill Gates, to receive an update on their Giving Pledge, through which they've asked their fellow rich to give more to charity.

Buffett, seen above in the Oval Office on Monday, likely gave the president some advice on the ongoing debt limit negotiations, as experts have warned that dragged-out talks could spook financial markets and that a U.S. default would be disastrous for the country's financial system. Buffett has been a prominent political backer of Obama since the 2008 presidential campaign.

The philanthropy-centered meeting fit nicely with the White House's recent economic message, as Obama has asked wealthy Americans to donate more to the U.S. government, in the form of taxes. "Even as we're trying to make sure that all those programs are affordable, we're also saying to folks like myself that can afford it that we are able and willing to do a little bit more; that millionaires and billionaires can afford to do a little bit more," he said at his press conference on the debt limit Friday.

Image credit: Pete Souza/White House