ISIS regroups to attack a fragmented Libya

The city of Sirte was once part of Libya's ISIS-controlled coastline from 2015 to 2016, before Libyan security forces combined with U.S. airstrikes wiped out ISIS combatants from the area. But sleeper cells still lurk in the Sirte desert, and though it no longer controls Libyan territory, ISIS has renewed its attacks there. NewsHour Weekend Special Correspondent Christopher Livesay reports.