“I defy you to find anybody who can go back and very accurately detail everything that happened 20, 30, 40, 50 years ago,” Carson said on Fox News’s “The Kelly File.”

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“You can give the general flavor and that’s what I did, working with a co-writer. You’re never going to have the exact details in that kind of situation.”

Carson has been openly warring with some in the media that have sought to verify details from his inspirational life story of growing out of poverty in Detroit to becoming one of the world’s foremost neurosurgeons.

Carson’s story is central to his widespread popularity and his rise in the Republican presidential race.

Some media outlets have been unable to verify that the stories from Carson’s childhood took place. Carson and his supporters have argued that just because the media hasn’t been able to verify the stories doesn’t mean they didn’t happen.

But in two instances, media outlets have confirmed the broad scope of the stories but found small details were different than how they were described in Carson’s books.

Fox News anchor Megyn Kelly on Wednesday challenged Carson on a particular story from his days as a college student at Yale.

In his book “Gifted Hands,” Carson recalled some students pulling a prank on his “Perceptions 301” course, in which they gave the students a fake, and much more difficult, final exam.

Carson wrote that most of the students walked out on the exam in protest, but that he sat and finished it and was given small financial reward for doing so.

Kelly noted that while the event has generally been verified, the course was not called “Perceptions 301,” and the prank would have taken place his freshman year, not his junior year as he wrote.

“That book was written 25 years ago,” Carson responded. “I don’t remember what the conversation was with the co-writer at that time. I remember that we had the class and I told him about the class and what happened and it’s been verified that it happened. But having every small detail, I don’t think it’s actually even reasonable. If everyone has all of the details and they remember to that specificity, that would make me actually suspicious.”