President Trump reveals himself as woefully uninformed about the basics of geography, incorrectly telling Indian Prime Minister Narendra Modi, “It’s not like you’ve got China on your border.” He toys with awarding himself the Medal of Freedom.

And, according to a new book by Washington Post reporters Philip Rucker and Carol D. Leonnig, Trump does not seem to grasp the fundamental history surrounding the attack on Pearl Harbor.

“Hey, John, what’s this all about? What’s this a tour of?” Trump asks his then-Chief of Staff John F. Kelly, as the men prepare to take a private tour of the USS Arizona Memorial, which commemorates the December 1941 Japanese surprise attack in the Pacific that pulled the United States into World War II.

“Trump had heard the phrase ‘Pearl Harbor’ and appeared to understand that he was visiting the scene of a historic battle, but he did not seem to know much else,” write the authors, later quoting a former senior White House adviser who concludes: “He was at times dangerously uninformed.”