The Trump administration has asked a federal judge to block the publication of former security adviser John Bolton’s book, arguing that Bolton had breached a contract and would risk exposing classified information.

The suit alleges that Bolton’s manuscript is “rife with classified information” and alleges that Bolton backed out of a White House vetting process for the book.

Bolton’s lawyer Charles Cooper has said that the administration’s efforts to block publication are “a transparent attempt to use national security as a pretext to censor Mr. Bolton, in violation of his constitutional rights to speak on matters of the utmost public import.”

The book is scheduled to publish later this month.