Asked about a recent book on President Joe Biden which suggested people around him had seen signs of cognitive and physical decline, Clinton said he never saw any cognitive decline, and did not feel that Biden was unfit to run for President. "I thought he was a good president. The only concern I thought he had to deal with was, could anybody do that job until they were 86?" Clinton said. "And we'd had several long talks. I had never seen him and walked away thinking, He can't do this anymore. He was always on top of his briefs.

"I haven't read the book. And I saw President Biden not very long ago, and I thought he was in good shape. But the book didn't register with me 'cause I never saw him that way."

Asked why he hasn't read the book, Clinton replied, "I didn't want to. 'Cause he's not president anymore, and I think he did a good job. And I think we are facing challenges today without precedent in our history. And some people are trying to use this as a way to blame him for the fact that Trump was reelected."