Full Episode: Sunday August 29, 2021

Collapse into chaos. The Biden administration is in damage control as the Taliban seizes power in Afghanistan, the military racing to evacuate Americans and our Afghan allies left behind. ABC "This Week" co-anchor Martha Raddatz sits down exclusively with US Defense Secretary Lloyd Austin, asking is the Pentagon was prepared -- and could the mission expand? Also, US Surgeon General Vivek Murthy has what you need to know about COVID-19 booster shots.