With the Tablian in control of Afghanistan after the U.S. troop withdraw, Washington Post reporter Craig Whitlock explains to CBS News' Elaine Quijano how two decades of decision-marking in Washington got us to current situation. Whitlock is the author of the new book, "The Afghanistan Papers: A Secret History of the War," which is published by Simon & Schuster, a division of ViacomCBS. Whitlock explains how the mission in Afghanistan evolved over the last 20 years.