John R. Bolton served as national security adviser to President Donald Trump and as U.S. ambassador to the United Nations under President George W. Bush. He is the author of The Room Where It ...

The book by CNN's Jim Sciutto also contains quotes about the former president's reported "admiration" of Hitler.

MORE: Everything you need to know about John Bolton, Trump's former national ... At the time of the book's release, Bolton told ABC News' Martha Raddatz that Trump was "not fit for office" and ...