WASHINGTON (AP) — New York hedge fund billionaire George Soros and Hollywood director Steven Spielberg are among the biggest donors to a super PAC backing Hillary Rodham Clinton's Democratic campaign for president.

That's according to an official at the super PAC, speaking on condition of anonymity because he was not authorized to discuss the group's fundraising.

The group is Priorities USA Action. It will report having raised $15.6 million in the past three months when it files a required report with federal regulators later this month.

Super PACs can take donations of unlimited size. The biggest gift was worth $2 million and came from media mogul Haim Saban, owner of the Spanish-language Univision network.

Clinton's campaign reported Wednesday it has raised $45 million since she declared her candidacy in mid-April.