Graham set out strict rules to keep his ministry from having any whiff of impropriety. That broad philosophy could be useful to White Houses. Stephen Chernin/Getty Images hide caption

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Stephen Chernin/Getty Images

Former President Bill Clinton plays with balloons onstage at the end of the fourth day of the Democratic National Convention at the Wells Fargo Center in Philadelphia in July. Aaron P. Bernstein/Getty Images hide caption

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Aaron P. Bernstein/Getty Images

Hillary Clinton chats with Goldman Sachs Chairman and CEO Lloyd Blankfein onstage during a panel discussion in 2014 of the Clinton Foundation's Clinton Global Initiative. Mark Lennihan/AP hide caption

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Mark Lennihan/AP

There's Really No Comparison Between The Trump And Clinton Foundations

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Hillary Clinton has defended the Clinton Foundation against allegations that it was a front for a "pay to play" scheme while she was secretary of state. Scott Eisen/AP hide caption

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Scott Eisen/AP

'Saving Lives' Or 'Selling Access'? Explaining The Clinton Foundation

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Democratic presidential nominee Hillary Clinton takes the stage at the Democratic National Convention in Philadelphia Wednesday night following President Obama's speech. Bill Clark/CQ-Roll Call Group via Getty Images hide caption

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Bill Clark/CQ-Roll Call Group via Getty Images

Former President Clinton defended Hillary Clinton's career during his speech at the Democratic National Convention on Tuesday, the night she formally became the party's presidential nominee. Chip Somodevilla/Getty Images hide caption

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Chip Somodevilla/Getty Images