Donald Trump attended a $25,000-per-ticket fundraiser Monday night at the Woodside, California home of Saul Fox, the CEO of private equity firm Fox & Paine.

Fox is the donor behind Children of Israel LLC, whose $884,000 in contributions has made it the second-most generous “ghost corporation” in the 2016 cycle. This election has seen a surge in “ghost corporations,” the term used for businesses that appear to exist solely to shield the identity of individuals who want to put money into the U.S. political process.

Fox’s ownership of Children of Israel was unknown until The Intercept reported on it several weeks ago.

Children of Israel gave $150,000 in 2015 to Pursuing America’s Greatness, a Super PAC supporting Mike Huckabee’s presidential run; $400,000 in 2016 to Stand for Truth, a Super PAC supporting Ted Cruz’s candidacy; and $334,000 to the Republican National Committee.

Fox is also a longtime GOP donor under his own name. He most recently gave $100,000 to Team Ryan, a joint fundraising committee set up by Speaker of the House Paul Ryan, R-Wis., and $25,000 to Donald Trump’s joint fundraising committee.

In addition to his Children of Israel contributions to their Super PACs, Fox personally gave $2,700 to Huckabee’s presidential campaign, as well as the $5,400 maximum to the campaigns of Cruz and Marco Rubio.

Fox also used a company called Mercury Trust in 2012 to donate $1 million to American Crossroads, a Super PAC co-founded by Karl Rove, and $425,000 to Restore Our Future, the Super PAC supporting Mitt Romney. Mercury Trust was later discovered to be affiliated with Fox’s private equity company.

(Thanks to Celine O’Hara for telling me about the Fox fundraiser.)