From The Wall Street Journal:
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.
“President Obama executed the nuclear deal as an executive agreement, not as a treaty.”
The Obama administration had help in its end-run around the Constitution. Instead of insisting on compliance with the Senate’s treaty-making prerogatives, Congress enacted the Iran Nuclear Agreement Act of 2015. Known as Corker-Cardin, it surrenders on the constitutional requirement that the president obtain a Senate supermajority to go forward with a major international agreement. Instead, the act effectively requires a veto-proof majority in both houses of Congress to block elements of the Iran deal related to U.S. sanctions relief. The act doesn’t require congressional approval for the agreement as a whole.
Last week the U.N. Security Council endorsed the Iran deal. The resolution, adopted under Chapter VII of the U.N. Charter, legally binds all member states, including the U.S. Given the possibility that Congress could summon a veto-proof majority to block the president’s ability to effect sanctions relief, the administration might be unable to comply with the very international obligations it has created. This is beyond reckless.