Another day, another leader of al-Qaeda is killed by U.S. forces. This time, it was Ayman al-Zawahiri, killed on his balcony in Kabul by a Hellfire missile strike. To talk about it all, Benjamin Wittes sat down with Lawfare senior editor Scott R. Anderson and Lawfare’s foreign policy editor Daniel Byman. Is it a big deal? Is it kind of old news that we’ve killed yet another al-Qaeda leader? How badly degraded is al-Qaeda? Who's going to replace al-Zawahiri? What does it mean for the Taliban's promises not to allow al-Qaeda attacks on the United States to be planned from its soil? And what is the international and domestic law of killing al-Qaeda leaders 21 years after 9/11.