In her new memoir, former First Lady Jill Biden defends her husband's mental fitness during the 2024 campaign.

But Jake Tapper says her account omits key details about Joe Biden's cognitive decline witnessed by Democratic insiders.

Tapper says she failed to adequately grapple with questions about his ability to run for president, to win the campaign, and to serve as president.

AI-generated summary was reviewed by a CNN editor.

“If you knew Joe Biden well, you’d know that if he actually got to the point where he wasn’t capable of doing the job, he would step down,” former first lady Jill Biden writes in her new memoir “View from the East Wing.” “Certainly, if he exhibited cognitive impairment, I would not hesitate to say so. His staff would not hesitate to say so. But he was nowhere near that point in the summer of 2024.”