A conservative lawyer who advises President Donald Trump on judicial nominations appears to be linked to an anonymous limited liability company that donated $1 million to the Trump inaugural committee, according to campaign finance records.

In December 2016, the Trump committee received a seven-figure check from BH Group, LLC. Journalists have tried for the past year to locate anyone who works for the company. The limited liability company only lists a paralegal at Holtzman Vogel, a conservative law firm, as its organizer in Virginia incorporation records.

A recent New Jersey congressional campaign filing may have helped unravel the mystery. The report lists Leonard Leo, an executive vice president at the Federalist Society, the conservative lawyers network, as an attorney for BH Group. Leo has served as an adviser to Trump on judicial nominations, and he helped lead Supreme Court Justice Neil Gorsuch through his Senate confirmation process last year.

Leo and the White House did not respond to questions from MapLight about his role with BH Group. Holtzman Vogel did not respond to MapLight’s request for comment.

The campaign report, filed by Jay Webber’s congressional campaign, was first highlighted by journalist Wendy Siegelman. Leo has been identified as the president of the BH Fund, a nonprofit that was given influence over hiring and admissions at George Mason University’s law school as part of an anonymous $20 million donation.

The only previous public reference to BH Group was in a tax return filed last year by the Wellspring Committee, a secretive conservative nonprofit. The dark money organization reported paying $750,000 to BH Group in 2016 for public relations.