Will Iran block oil shipments in Gulf?

In case of the United States bans Iranian oil sails, an Iranian Revolutionary Guards threaten to block oil shipments through the Strait of Hormuz in Gulf.
“If they want to stop Iranian oil exports, we will not allow any oil shipment to pass through the Strait of Hormuz,” Ismail Kowsari was quoted as saying by the Young Journalists Club (YJC) website.
The Source: Reuters