Following the Obama administration’s signing of the 2015 Iran nuclear deal, which significantly rolled back Iran’s nuclear program and imposed rigorous limitations on it for the foreseeable future, Congress passed legislation requiring the president to certify every 90 days that Iran is complying with its obligations under the agreement.

President Trump has done this twice so far. But he has given strong indications that he will refuse to do it a third time. With the next 90-day deadline approaching on October 15, the survival of the Iran deal hangs in the balance.