The Pentagon on Thursday threatened legal action against the Navy SEAL who has written a book recounting his role in the raid that killed Al-Qaeda chief Osama bin Laden.

“In the judgment of the Department of Defense, you are in material breach and violation of the non-disclosure agreements you signed” and the Pentagon is considering “all remedies legally available to us,” Defense Department general counsel Jeh Johnson wrote in a letter to the author, who writes under the pseudonym “Mark Owen.”