America’s Miscalculations, Afghanistan’s Collapse

The last few days in Afghanistan have been chaotic as the Taliban retake control of the country. The debacle can be traced to a number of assumptions that guided the U.S. decision to withdraw from the country this year after two decades of war. How could those assumptions have proved so wrong, so quickly? Guest: David E. Sanger, a White House and national security correspondent for The New York Times.