A pro-Trump legal organization founded by former White House aide Stephen Miller has filed a lawsuit against Supreme Court Chief Justice John Roberts, in an effort that many see as a long shot, as Trump allies push back against court rulings that have blocked key executive actions.

The lawsuit, filed by the America First Legal Foundation, targets Roberts in his role as head of the U.S. Judicial Conference, along with Robert J. Conrad, director of the Administrative Office of the U.S. Courts, Fox News reported.

The complaint claims that both the Judicial Conference and the Administrative Office have engaged in regulatory actions that surpass their constitutional authority, arguing these actions fall outside the judiciary’s essential responsibilities of adjudicating cases and providing administrative support.