Secretary of Transportation Pete Buttigieg tells NPR that the Biden administration is focused on resolving supply chain issues in time of the holiday shopping season. Also: what is a supply chain and why are they causing issues?This episode: White House correspondent Asma Khalid, and chief economics correspondent Scott Horsley.Connect:Subscribe to the NPR Politics Podcast here.Email the show at nprpolitics@npr.orgJoin the NPR Politics Podcast Facebook Group.Listen to our playlist The NPR Politics Daily Workout.Subscribe to the NPR Politics Newsletter.Find and support your local public radio station.