A forthcoming book revealed that President Donald Trump once touted a document that he received comparing him to world leaders like Josef Stalin and Adolf Hitler, which he claimed was written by a "presidential historian" but was actually written by the caddy of one of Trump's golf partners, according to a new report.

New York Times reporters Maggie Haberman and Jonathan Swan interviewed Trump for their forthcoming book, Regime Change, in March, where the president showed the reporters a document that argued he was more powerful than some of the most powerful strongmen in history, like Attila the Hun, Genghis Khan, Napoleon, Stalin, Mao, and Hitler. After doing a little digging, the reporters found out the document was not authored by a presidential historian, as Trump claimed, but was written by Gary Player's long-time caddy, who gave Trump the document at Mar-a-Lago, CNN reported.

"But when Swan and Haberman tried to find the author, it turned out he was not a historian, but actually Player’s longtime caddy and personal confidant. The caddy told Haberman and Swan that he 'had first shared his assessment of Trump’s power with Player and later explained it directly to Trump over golf in Florida,'" according to the report.