Chief Justice John Roberts called the leak of a Supreme Court draft opinion that would undo Roe v. Wade “absolutely appalling” on Thursday in his first public appearance since the leak.

Roberts made the remark during an appearance at the 11th Circuit Judicial Conference in Atlanta, according to a report. The chief justice also said he hoped “one bad apple” would not affect “people’s perception” of the high court, CNN reported, and he added that “the person” or “people” who leaked the document are “foolish” if they think it will affect the court’s work.