Tom Williams/Roll Call/Getty Images

No wonder President Obama called George Clooney a "good friend" in a recent interview with "Entertainment Tonight." The actor is doing what he can to help the president win his re-election bid in November.

Clooney appeared Monday at a fundraiser for Obama in Geneva, Switzerland, that raised at least $625,000 from U.S. donors, according to organizers. It cost $15,000 for guests to have dinner with Clooney, and $5,000 to have a photo taken with him.

RELATED: White House, Hollywood Ties Date Back Decades

There was also a $1,000-per-person reception before the dinner. The event was co-hosted by Geneva-based American lawyer Charles C. Adams Jr. and Matthew Barzun, Obama's campaign finance chairman, The Associated Press reported.

Foreigners are banned from contributing to U.S. political campaigns but U.S. citizens and green-card holders can legally donate regardless of where they live, according to the AP.

Clooney traveled to the event from his villa in Lake Como, Italy.

Clooney hosted a fundraiser for Obama in May at his Los Angeles home that raised almost $15 million.