The U.S. government is planning on taking a tougher line on Iran in the months ahead, redoubling its efforts to cut Iran’s oil exports down to zero. Brian Hook, the State Department’s special representative for Iran, boasted earlier this week about the U.S.’ success in curtailing Iran’s oil exports to date. In an interview with Bloomberg, Hook noted that when the Trump administration withdrew from the Iran nuclear deal last May, Iran was exporting 2.7 million barrels per day (mb/d). Now, he says, Iran’s exports are…