Former FBI Director James Comey discussed sensitive government matters on his private email account, despite previously saying he did so only for “incidental” purposes.

The Cause of Action Institute, a conservative watchdog group, has obtained hundreds of Comey’s emails through a Freedom of Information Act lawsuit and released some of them Friday evening. The Justice Department acknowledged to the group that Comey and his chief of staff discussed government business on 1,200 pages of messages from his personal Gmail account.