Four factors behind the compromise on Iran legislation

On Tuesday, senators succeeded in getting the White House to back down on its threat to veto a bill requiring congressional review of an Iran deal. The question in Congress was never whether lawmakers could pass a bipartisan bill that gives them a say in any final nuclear deal with Iran. Rather, the issue was how to shape such a bill so that it could sustain a promised presidential veto – or cause the White House to drop its threat. The compromise answered some White House concerns, although S