The nuclear deal between Iran and six global powers is set to spark a fierce foreign policy fight on Capitol Hill, pitting Republicans and potentially some Democrats against President Barack Obama in his push to implement what would be a cornerstone of his international legacy. Implementation of the accord depends on whether Mr. Obama can retain the support of enough of his party’s lawmakers in the face of what is almost certain to be widespread GOP opposition . Congress is expected to review the agreement and vote on it in early September, and the initial Republican reaction signaled deep resistance to the deal. The prospect that the GOP-controlled Congress will try to block the deal puts Mr. Obama in the familiar position of trying to minimize defections from his own party and leaves Democrats considering whether they can back an agreement vilified across the aisle. “The deal that we […]