Executive Order 12667

Executive Order 12667 established a procedure for former United States Presidents to limit access to certain records which would otherwise have been released by the National Archives and Records Administration under the Presidential Records Act of 1978. It was issued by President Ronald Reagan on 18 January 1989.

The Executive Order was revoked by President George W. Bush's Executive Order 13233 on 1 November 2001, which further limited access to the records of former United States Presidents. This order was in turn revoked by President Barack Obama's Executive Order on January 21, 2009 (his first day in office), which essentially restored the provisions of Executive Order with some modifications.

Before releasing any records of a former President, the Archivist of the United States must notify both the incumbent President and the former President of any records which the Archivist believes may be subject to a claim of Executive privilege. Each President then has 30 days to submit the claim in writing to the Archivist.

If after 30 days the Archivist has received no claims, he releases the records pursuant to the PRA.

...
Wikipedia