Republicans, intrepid as always, in their willingness to rush into places where angels fear to tread, may have insured that Iran becomes one of the world's nuclear powers by interfering in the negotiations. If the Republicans succeed in scuttling the negotiations, in the court of the world's opinion, they will own the the reason for the failure to reach detente. The U.S. has had no diplomatic ties and few commercial ties to effectively levy sanctions on Iran, and it is the Europeans who have been putting the screws, so effectively, to the Iranian economy. If and when negotiations are broken off, public opinion in those European countries may force lifting the sanctions thus handing a bloodless victory, just as they were handed a victory over Saddam Hussein, without losing a drop of their blood, by George W. Bush.
There must be something in the stuff Republicans drink that makes them so clumsy when it comes to diplomacy.