It seems they [ America] do not understand what they are saying when they say Iran will not be allowed to export even a single drop of oil. All right, if you can do such a thing, do it and see the result!

Source here.

 

Rouhani did not elaborate, but Iran long has asserted it could shut down the Strait of Hormuz, the narrow body of water that separates the Persian Gulf from the wider world. A third of all oil traded by sea passes through the strait and the U.S. Navy regularly has direct, tense encounters with Iran's paramilitary Revolutionary Guard there.