In a revealing moment of regret, U.S. Supreme Court nominee Neil Gorsuch said Wednesday that a 2006 email he wrote calling negative attention to big-firm lawyers who were representing Guantanamo detainees was “not my finest moment.”

Sen. Dick Durbin, D-Illinois, confronted Gorsuch about the email, disclosed among thousands of pages of documents from Gorsuch’s time in the U.S. Justice Department’s Civil Division from 2005 to 2006.