The U.S. launched a fourth straight night of strikes and is reimposing 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.Notice: Transcripts are machine and human generated and lightly edited for accuracy. They may contain errors.

Geoff Bennett:

Tonight, the U.S. is launching the fourth night of strikes in a row, and it's 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 return continues to attack ships and U.S. allies in the Gulf and refuses to reopen the Strait of Hormuz.Nick Schifrin has more.

Nick Schifrin:

Tonight, U.S. warships are once again blockading Iranian ports. The U.S. will prevent all Iranian ships or ships doing business with Iran from either departing or arriving in the ports where Iran exports oil and imports essential goods.