The White House says that former national security adviser John Bolton’s book contains top secret information in a letter addressed to his attorney that was publicly released Wednesday.

The state of play: The development, first reported by CNN’s Jake Tapper, sets up a potential legal battle between Bolton and the White House over the book’s publication, which is currently scheduled for March 17.

DOWNLOAD THE WAR ROOM PODCAST FREE

The letter, dated Jan. 23, claims the book “contains significant amounts of classified information” that could “cause exceptionally grave harm” to U.S. national security.

READ MORE AT AXIOS