Did Comey's release of memos about his Trump meetings violate executive privilege? - LA Times
"So did Comey violate any law or privilege by releasing the memo recounting his conversations with Trump?

Probably not. Several lawyers said he was free to reveal the information. But some were troubled by Comey disclosing the actual memo.

“These were unclassified notes made by Comey himself. I know of no legal bar to his releasing them to the press,” said Walter Dellinger, a former White House lawyer under President Clinton.

Lawyers pointed to the dozens of books written in which former White House aides described their times working with the president, including details about their confidential conversations. The 1st Amendment and its protection for the freedom of speech would probably stand in the way of any effort to block such a book, assuming it did not reveal classified information.

But some lawyers said government employees are prohibited from taking documents from their agencies and releasing them to the public. They said Comey may have left himself open to criticism if he released to the press the memos he wrote while employed at the FBI."