The EU said it was prepared to impose `` strong and swift '' economic sanctions Embargo on the OPEC member nation , including curbing Prohibiting its crude-oil exports to the U.S. , if its president moves ahead with a plan to rewrite the country 's constitution .

The case for prolonging the accord -- which calls for curbing Cause.movement.down.loss production by 1.2 million barrels a day and ends this month -- is straightforward .

The memo , sent by the White House to the U.S. State Department , paves the way for U.S. efforts to curb Cause.movement.down.loss Iranian oil exports after Washington 's decision to pull out of the 2015 deal between Iran and six world powers curbing Prohibiting Tehran 's nuclear program .