The U.S. House of Representatives overwhelmingly approved legislation on May 14 allowing Congress to review any potential nuclear agreement with Iran, sending the bill to the White House.  The bill, which also passed the Senate by a veto-proof margin, creates a 30-day review period for Congress.  If both houses of Congress disapprove of the nuclear agreement and then override the President's veto, the President would not be permitted to exercise his authority to waive sanctions on Iran.  Otherwise, the President would be allowed to waive sanctions at the end of the congressional review period.