They will then vote to override President Obama's veto of their resolution. And if the GOP fails there, Gov. Scott Walker says his first act as president would be to kill the deal.

But before the party commits to abrogating the Iran deal in 2017, the GOP should consider whether it would be committing suicide in 2016.

For even if Congress votes to deny Obama authority to lift U.S. sanctions on Iran, the U.S. will vote to lift sanctions in the U.N. Security Council. And Britain, France, Germany, Russia and China, all parties to the deal, will also lift sanctions.

A Congressional vote to kill the Iran deal would thus leave the U.S. isolated, its government humiliated, unable to comply with the pledges its own secretary of state negotiated.