Throughout Trump's tenure, he frequently criticized NATO allies, particularly Germany, for not meeting the alliance's defense spending targets. He asserted that Germany owed "vast sums of money to NATO," a claim that Merkel and other German officials disputed.

The eagerly anticipated 736-page book is expected to shed new light on former German Chancellor Angela Merkel's four terms in office between 2005 and 2021, when she was the world's most powerful woman.