H.R. McMaster: Afghanistan's fall an 'American catastrophe'

To examine the Taliban's takeover of Afghanistan and how it impacts U.S. interests, Judy Woodruff speaks to retired Lt. Gen. H.R. McMaster. He was national security advisor during the Trump administration and also served as a military officer in Afghanistan from 2010 to 2012, heading up a task force focused on combating corruption. He is a senior fellow at Stanford University's Hoover Institution.