Picking up the theme of Peter Schweizer‘s latest book, Clinton Cash, Joshua Green of Bloomberg Businessweek highlights one example in which a jet-setting billionaire, Frank Giustra, with ties to former President Bill Clinton could lead to political headaches for Hillary Clinton.

What looms as a greater threat to Hillary Clinton’s presidential ambitions than the details of the Russian uranium transaction is that Giustra is the first of what may be a procession of similar figures who will be in the spotlight between now and Election Day. That’s because anyone with the means to give millions of dollars to the Clinton Foundation likely also has global financial interests affected by U.S. policy or, at the very least, would benefit from a favorable relationship with the Clintons. As Giustra himself notes, “He’s one of the best brand names in the world.”

The potential conflicts of interest are nearly limitless—and so is the potential for political damage. According to a study by Vox, a news and policy analysis website, 181 contributors to the Clinton Foundation also lobbied the State Department while Hillary Clinton ran it. That’s enough to furnish several more volumes of Clinton Cash, should Schweizer have the fortitude to produce them.

On May 5, the Clinton campaign rolled out a website, the Briefing, to attack Schweizer and rebut the book’s insinuations of corruption. But the damage Hillary Clinton has sustained is largely self-inflicted. Although the Clinton Foundation signed an agreement with the White House to disclose its donors as a condition of her becoming secretary of state, it hasn’t fulfilled the pledge. A New York Times investigation of Giustra’s uranium mining deal turned up donors whom the Clinton Foundation failed to disclose. Bloomberg found an additional 1,100 undisclosed foreign donors. The Boston Globe turned up even more.