However, many critics dispute whether this method was the most reliable. The most cited example was O'Donnell's complete acceptance of Albert Speer's claim to have tried to assassinate Hitler. While many professional historians dispute this claim due to lack of evidence, O'Donnell wrote about it unquestioningly. It is arguable that, if one compares the accounts written in "The Bunker" with those in "Inside the Third Reich", that O'Donnell presents the supposed assassination attempt as more dramatic and purposeful. Admittedly, O'Donnell befriended Speer, and interviewed him 17 times for the book, more than any other witness.