President Trump abruptly called off negotiations between the United States and the Taliban that could have ended the war in Afghanistan and canceled a secret meeting at Camp David. We look at how a historic peace deal went off the rails. Guest: Peter Baker, the chief White House correspondent for The New York Times. For more information on today’s episode, visit nytimes.com/thedaily. Background reading:The United States and the Taliban, after nine rounds of painstaking negotiations in Doha, Qatar, appeared to have ironed out most of the issues between them. But President Trump canceled a secret meeting at Camp David and called off the talks.What jarred many Afghans was how a single attack and the death of one American, cited by Mr. Trump, could upend 10 months of negotiations.