Source present at the time tell The Daily Beast that multiple people—including Vietnam War veterans—chimed in to inform the president that the Apocalypse Now set piece he was talking about showcased the U.S. military using napalm, not Agent Orange.

Trump refused to accept that he was mistaken and proceeded to say things like, “no, I think it’s that stuff from that movie.”

One clue belying the president’s insistence is that the famous Robert Duvall line from the scene in Apocalypse Now, “I love the smell of napalm in the morning,” is not “I love the smell of Agent Orange in the morning.”

He then went around the room polling attendees about if it was, in fact, napalm or Agent Orange in the famous scene from “that movie,” as the gathering—organized to focus on important, sometimes life-or-death issues for veterans—descended into a pointless debate over Apocalypse Now that the president simply would not concede, despite all the available evidence.