Chief Justice John Roberts Jr. made a rare appearance on Monday before the American Bar Association’s House of Delegates, hailing the importance of the Magna Carta as a foundation of “our fundamental freedoms” on the eve of its 800th birthday next year.

Roberts also called upon the nation’s lawyers to help promote “the public’s confidence in the integrity of our judicial system.” Citizens need to understand that the judiciary is the branch of government that is supposed to “rise above partisan political debates,” he said.