Joe Biden says he did not know he had cancer while he was president and would not have sought a second term if he already had been diagnosed.

The former Democratic president's comments came in an interview with People magazine before the release of his White House memoir on Tuesday.

"If I had known that I was feeling lousy because I had cancer," said Biden, who turns 84 on Nov. 20, "I would've not gone forward" with a 2024 reelection bid that ended after a disastrous debate performance against Republican Donald Trump.