A California congressman warned two Supreme Court justices Wednesday that the controversy over the low number of minority law clerks hired at the Court “is not going to go away.”

Speaking at the high court’s annual budget hearing before a House appropriations subcommittee, Rep. Julian Dixon (D-Calif.) grilled Justices David Souter and Clarence Thomas about what they had done to increase diversity in the ranks of law clerks, who play a key behind-the-scenes role in the work of the Court.