Iran has the ability to temporarily block the Strait of Hormuz but the U.S. “would take action and reopen” it, Joint Chiefs of Staff chairman General Martin Dempsey said Sunday, making clear to Iran that in threatening to close the straits, it is literally playing with fire. . “They’ve invested in capabilities that could, in fact, for a period of time block the Strait of Hormuz,” Dempsey said in an interview for CBS's “Face the Nation." “We’ve invested in capabilities to ensure that if that happens, we can defeat that.” Blocking the strategic shipping lane linking the Gulf of Oman...