President Obama agreed to sign a compromise bill on Tuesday allowing Congress a say in the Iran nuclear deal while the Senate Foreign Relations Committee moved the legislation to the full Senate for a vote. An unusual alliance of the president’s Democratic supporters and Republican opponents of the deal demanded a congressional role as international negotiators attempt to finalize the deal by June 30. Congress will now have an opportunity to vote on the deal, though opposing the president could prove futile. If Congress does not approve the agreement, President Obama could veto that legislation and would need only 34 senators to sustain the veto. Though interpretations of the president’s relent differ between the two parties, the compromise bill is one more step forward in reaching a nuclear agreement with Iran.