Democratic mega-donor George Soros is backing a super-PAC dedicated to electing former Secretary of State Hillary Clinton as president in 2016.

The super-PAC, Ready for Hillary, tweeted on Thursday that Soros would serve as one of the co-chairs of the group’s national finance council.

Soros, a billionaire hedge fund manager who has launched a number of liberal advocacy groups, has pledged $25,000 to the PAC, according to Reuters.

“His support for Ready for Hillary is an extension of his long-held belief in the power of grassroots organizing,” Soros spokesman Michael Vachon told Reuters.