President Obama’s executive agreement with Iran is enormously controversial for good reason. Negotiated in coordination with Russia, China, France, Germany and the United Kingdom, the deal welcomes Iran as a participant in the world community conditioned only on marginal changes to its nuclear program. It effectively allows Iran to maintain technology that would lead to a nuclear weapon, as well as continue its human-rights abuses, sponsoring of terrorism, imprisoning of American hostages, and threats to American allies, including Israel.

Fortunately,...