Who knew what when? Two new books paint a damning portrait of the Democratic Party and what some of its members knew about President Joe Biden’s deteriorating health during the 2024 campaign. On “The Opinions,” the Times editor at large Aaron Retica is joined by the columnist Carlos Lozada to discuss “Original Sin” by Jake Tapper and Alex Thompson and “Fight: Inside the Wildest Battle for the White House” by Jonathan Allen and Amy Parnes. Retica and Lozada explore the books’ shared themes and where the beleaguered party goes from here.

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This episode of “The Opinions” was produced by Vishakha Darbha. The rest of the show's production team includes Derek Arthur, Kristina Samulewski and Jillian Weinberger. It was edited by Alison Bruzek and Kaari Pitkin. Mixing by Carole Sabouraud. Original music by Pat McCusker and Carole Sabouraud. Fact-checking by Mary Marge Locker. Audience strategy by Kristina Samulewski and Shannon Busta. The director of Opinion Audio is Annie-Rose Strasser.