But the White House has sued Bolton, claiming that he did not follow the requirements of his pre-publication screening process by government officials. President Trump’s legal team also claims that, if published, the book would damage critical areas of United States national security.

On Wednesday, the White House’s stance on the book was affirmed by the director of the National Security Agency, General Paul M. Nakasone. In a signed affidavit filed in US District Court in Washington, Gen. Nakasone said he had been asked by the legal adviser of the National Security Council to review “a limited portion” of the draft manuscript of Bolton’s book. He added that he had identified “classified information” in that portion of the manuscript, some of which was classified at the Top Secret/Sensitive and Compartmented Information (TS/SCI) level.

According to Gen. Nakasone’s affidavit, “compromise of this information could result in the permanent loss of a valuable SIGINT source and cause irreparable damage to the US SIGINT system”. SIGINT refers to the gathering of intelligence by intercepting communications signals in the form of information exchanged orally between people or mediated via electronic means.

Gen. Nakasone goes on to state that the unauthorized disclosure of the information contained in Bolton’s book could “reasonably […] be expected to result in exceptionally grave damage” to US national security. This includes causing “considerable difficulties in US and allied relations with specific nations”. The NSA director does not detail the precise damage that Bolton’s revelations could cause to US national security, stating only that the information would compromise an intelligence-collection “capability” that “significant manpower and monetary investments have been and continue to be made to enable and maintain”.

Alongside Gen. Nakasone’s affidavit, the Department of Justice submitted an emergency filing on Wednesday, seeking to block the publication of Bolton’s book on national security grounds. Another affidavit was filed on Wednesday by John Ratcliffe, President Trump’s newly appointed Director of National Intelligence.