GOP likely to draw up legislation that would require Obama to submit Iran deal for approval . New legislation could hurt hard - liners in Congress . Last year , critics sought to derail an interim nuclear deal , but failed largely because Democratic Senate Majority Leader Harry Reid blocked sanctions bills . White House likely to warn of possible march to war if agreement fails .
GOP likely to draw up legislation that would require Obama to submit Iran deal for approval . New legislation could hurt hard - liners in Congress . White House likely to warn of possible march to war if agreement fails .