The Senate's overwhelming approval May 7 of bipartisan legislation to review the Iran talks masks a deep partisan fissure that's almost guaranteed to crack wide open over the summer.
Even as the bill's Republican and Democratic co-sponsors held a joint news conference celebrating the 98-1 passage of their bill, lawmakers on both sides of the issue were busy gearing up for a tough fight over what comes next. Republicans all but promised to hold an up-or-down vote to lift sanctions if there's a final deal, while liberal Democrats scrambled to demonstrate that they have the votes to uphold a presidential veto if it comes to that.