Chief Justice John Roberts warned a group of graduating laws students Monday that the rule of law is “endangered.” Without naming any names, the conservative justice also said during an event with students at Georgetown University that recent attacks against Supreme Court justices have gone too far.

Speaking at Georgetown Law, Chief Justice John Roberts denounced “ad hominem” criticism of the justices and argued for more civics classes for U.S. students. Roberts suggested recent verbal attacks on the justices had gone too far,