President of the Ethics and Public Policy Center Ed Whelan on Friday apologized for identifying a classmate of Supreme Court nominee Brett Kavanaugh as the person who could have sexually assaulted Christine Blasey Ford, the woman who has accused Kavanaugh of assault.

“I made an appalling and inexcusable mistake of judgment in posting the tweet thread in a way that identified Kavanaugh’s Georgetown Prep classmate. I take full responsibility for that mistake, and I deeply apologize for it. I realize that does not undo the mistake,” Whelan posted to Twitter Friday.