Oct. 15 will be decision day for President Donald Trump. That is the next deadline, under terms of the Corker-Cardin Iran Nuclear Agreement Review Act, for Trump to certify both that Iran is compliant with the Joint Comprehensive Plan of Action and that the Iran deal remains vital to the national security interests of the U.S.

Trump has pilloried the Iran nuclear deal he inherited as “the worst deal ever,” but Defense Secretary James Mattis testified in Congress Tuesday that the JCPOA is working, and press reports suggest that Secretary of State Rex Tillerson wants to amend the Corker-Cardin legislation to relieve the pressure upon the president and to avoid battles about recertification every three months.