Nick Penzenstadler

USA TODAY

Billionaire financier George Soros donated $6 million to a super PAC supporting Hillary Clinton in the second half of the year, bringing his total donation to $7 million.

Soro's December contribution topped all individual donations to Priorities USA Action, according to a report the group filed Sunday with the Federal Election Commission. Soros is a well-known figure in Democratic fundraising circles and spent more than $20 million in 2004 in an unsuccessful effort to toss out President George W. Bush.

Soros supported President Obama through several super PAC donations in 2012, and has been particularly outspoken this cycle about defeating Donald Trump, saying in January that Trump "is doing the work of ISIS."

Soros: Trump Is Doing the Work of ISIS

Altogether, Priorities USA raised $25.3 million in the second half of 2015, and had $35.8 million cash reserves at the end of the year.

In addition to Soros, the Priorities USA Action benefited from Hollywood billionaires Cheryl and Haim Saban who contributed $1.5 million each and Hollywood producer Tom Tull, who donated $1 million. California investor Herb Sandler contributed $1.5 million to Priorities, as did money manager Donald Sussman.

Priorities fund took in 80 contributions in the second half of the year, 31 of which hit or exceeded $100,000.