House Speaker Mike Johnson’s (R-LA) political spokesperson denied on Wednesday allegations that Johnson was involved in boosting Maureen Galindo, an antisemitic Democratic candidate in Texas’ 35th Congressional District.

The spokesperson said that Johnson had no involvement in the district’s Democratic primary, which Galindo lost on Tuesday.

The statement came after the Democratic Congressional Campaign Committee blasted Johnson in response to an article in the newsletter Popular Information that linked Lead Left PAC, the shadowy super PAC that supported Galindo, to a prominent GOP compliance consulting firm. One of the founders of that group, Caleb Crosby, has served as the treasurer for the Congressional Leadership Fund and Senate Leadership Fund, the primary super PAC arms of House and Senate leadership.

The origins of the pro-Galindo effort have been heavily shrouded in mystery, but national Republicans would have had an interest in boosting the less-electable Galindo in a swing-district race that Democrats hope to win. It’s unclear the extent to which Crosby or his firm, which advertises compliance reporting, budgetary and fiscal management and other similar services, would have been involved in any strategic decision-making for the Lead Left PAC.

“Mike Johnson’s political operation boosted a dangerous antisemite in the TX-35 Democratic primary runoff in an attempt to gain political power,” DCCC spokesperson Courtney Rice said in a statement. “This should shock the core of the Republican Party, and every single Republican needs to stand and speak out against this cynical political move.”

CLF and Crosby’s consulting firm, Crosby Ottenhoff Group, did not respond to a request for comment.