President Biden said the U.S. has "delivered" justice after a U.S. drone strike over the weekend killed al-Qaeda leader Ayman al-Zawahiri, one of the world's most wanted terrorists and a key mastermind behind 9/11.
Why it matters: The CIA operation has delivered the most significant blow to al-Qaeda since the death of Osama bin Laden, whom al-Zawahiri succeeded in 2011.