The Times reported that the manuscript included a bombshell claim that Trump explicitly linked a hold on Ukraine aid to an investigation of Joe and Hunter Biden. Trump told Bolton in August, according to a transcript of Bolton's forthcoming book reviewed by the Times, "that he wanted to continue freezing $391 million in security assistance to Ukraine until officials there helped with investigations into Democrats including the Bidens."
The Times further reported that Bolton had circulated "drafts of a manuscript he has circulated in recent weeks to close associates" and also "sent a draft to the White House for a standard review process for some current and former administration officials who write books."
Sarah Tinsley, a senior adviser to Bolton, told Fox News he had submitted a hard copy draft of his manuscript to the NSC [National Security Council] several weeks ago for "pre-publication review," but had not shared it with anyone else. The NSC is the White House's internal national security and foreign policy arm.
A "pre-publication review" is standard for any former government officials who held security clearances and publicly write or speak publicly about their official work. The review typically would focus on ferreting out any classified or sensitive material in advance of publication, and could take from days to months.