The Obama administration has gained space to negotiate a nuclear deal with Iran as Congress struggles to unify around a single set of demands for a final agreement.
Proponents of tougher conditions claimed victory on Tuesday when 83 senators signed on to a letter to the president spelling out their conditions for a final deal. The letter doesn't have force of law, however, and a less prescriptive letter garnered 395 signatures in the House — along with several key Democrats in the Senate.
