(CNN) After announcing the death of ISIS leader Abu Bakr al-Baghdadi, President Donald Trump on Sunday took questions from journalists -- and made a major false claim about his past statements on Osama bin Laden.

Trump claimed he had been prescient about the danger posed by bin Laden, having called for the death of the al Qaeda leader in a "very successful" book he published in the year before the September 11, 2001, terrorist attacks.

Trump said that he knew the threat from bin Laden at a time when "nobody" had "ever heard of" bin Laden.

"About a year -- you'll have to check it, a year, year and a half before the World Trade Center came down, the book came out. I was talking about Osama bin Laden. I said, 'You have to kill him. You have to take him out.' Nobody listened to me," he said.

"Let's put it this way: if they would have listened to me, a lot of things would have been different," he said.

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