Carter Page, who served as an informal foreign policy adviser to President Donald Trump’s 2016 presidential campaign, filed a federal lawsuit against the Democratic National Committee, Perkins Coie and two of the law firm’s partners Thursday, accusing them of destroying “his once-private life.”

Perkins Coie’s close relationship to the DNC, and its role in hiring private investigation firm Fusion GPS to undertake opposition research on Trump, has made the firm an unlikely household name and frequent conservative punching bag since the election. In his lawsuit, Page claims the DNC, Perkins Coie and its partners—political law practice chair Marc Elias and Michael Sussmann—defamed him through the so-called “Steele dossier” produced by Fusion GPS.