Lawyers at Boies Schiller Flexner filed a defamation lawsuit Tuesday on behalf of the brother of Seth Rich, a Democratic National Committee staffer whose 2016 murder is the basis for various right-wing conspiracy theories.

Boies Schiller partner Michael Gottlieb represents Aaron Rich, whose lawsuit in the federal district court in Washington, D.C., alleges conservative newspaper The Washington Times, Texas businessman Ed Butowsky and right-wing activist Matt Couch and his organization America First Media, have engaged in a “defamatory campaign” against him, painting him as a criminal.