Pentagon officials are trying to prepare for all of the ways Iran could retaliate, as President Trump hints at what he might do.

This has stoked speculation that Iran’s leadership may reach for another way to pressure its enemies to relent — blocking or effectively closing the Strait of Hormuz to shipping. This narrow waterway at the mouth of the Persian Gulf handles around a quarter of the world’s oil trade.

The Iranian government reveals its plan to close the Strait of Hormuz, a crucial waterway responsible for 20 percent of the world's oil consumption.