How did the failure in Afghanistan come about and who is to blame? Multiple administrations and both parties own the blame for the state of the nation, says Col. Andrew Bacevich (ret.) of the Quincy Institute. We now have a responsibility to provide continued military and diplomatic support for the nation after our 20 year engagement, says Lisa Curtis of the Center for a New American Security. PBS NewsHour is supported by - https://www.pbs.org/newshour/about/funders