Ambassador Zalmay Khalilzad, the former U.S. special representative for Afghan reconciliation, joins Aaron David Miller to debrief the withdrawal from Afghanistan, what went wrong, and where the United States goes from here.

The conflict in Afghanistan is the United States’ longest-running war. Despite the progress made there since September 11, 2001, the persistence of the Taliban insurgency is perhaps still the most debilitating challenge facing the country.