What to know about Israel's killing of Hezbollah leader Hassan Nasrallah

Israel's assassination of Hezbollah leader Hassan Nasrallah is reverberating across the region, raising fears of retaliation from Iran and a wider war. Nick Schifrin reports from Tel Aviv and joins John Yang to discuss the latest developments and what to expect next. PBS News is supported by - https://www.pbs.org/newshour/about/funders