The Obama end-run around the Constitution could yet be blocked if states exercise their own sanctions regimes.
The Iranian nuclear agreement announced on July 14 is unconstitutional, violates international law and features commitments that President Obama could not lawfully make. However, because of the way the deal was pushed through, the states may be able to derail it by enacting their own Iran sanctions legislation.
President Obama executed the nuclear deal as an executive agreement, not as a treaty. While presidents have used executive agreements to arrange less-important or temporary matters, significant international obligations have always been established through treaties, which require Senate consent by a two-thirds majority.
The Constitution’s division of the treaty-making power between the president and Senate ensured that all major U.S. international undertakings enjoyed broad domestic support. It also enabled the states to make their voices heard through senators when considering treaties—which are constitutionally the “supreme law of the land” and pre-empt state laws.