U.S. launches more strikes, tightens naval blockade as Iran hits Gulf allies

The U.S. launched a fourth straight night of strikes and is relaunching its naval blockade of all Iranian ports, its most formal step toward resuming full-scale war with Iran. President Trump says the move is designed to starve Iran's regime of oil revenue. Iran, in turn, continues to attack ships and U.S. allies in the Gulf, and refuses to reopen the Strait of Hormuz. Nick Schifrin reports.