President Joe Biden confirmed the final withdrawal of U.S. troops from Afghanistan just 11 days shy of the 20th anniversary of 9/11. Now, Afghanistan remains in turmoil following a takeover by Taliban forces.

The melancholy moment has thrust into focus the past 20 years, as experts comment on how the U.S. could’ve done better. Yet, much of what transpired in the past two decades is entangled in international law, a subject detailed in a new edited volume published by Kim Lane Scheppele of the Princeton School of Public and International Affairs.

In this episode, Kim discusses the findings from book, “9/11 and the Rise of Global Anti-Terrorism Law,” and its implications for Afghanistan. An expert on constitutional and international law, Kim is the Laurance S. Rockefeller Professor of Sociology and International Affairs.