President Donald Trump plans to announce next week that he will “decertify” the international nuclear deal with Iran, saying it is not in the national interest of the United States and kicking the issue to a reluctant Congress, people briefed on an emerging White House strategy for Iran said Thursday.

The move would mark the first step in a process that could eventually result in the resumption of U.S. sanctions against Iran, which would blow up a deal limiting Iran’s nuclear activities that the country reached in 2015 with the United States and five other nations.

Trump is expected to deliver a speech, tentatively scheduled for Oct. 12, laying out a larger strategy for confronting the nation it blames for terrorism and instability throughout the Middle East.

Under what is described as a tougher and more comprehensive approach, Trump would open the door to modifying the landmark 2015 agreement he has repeatedly bashed as a raw deal for the United States. But for now he would hold off on recommending that Congress reimpose sanctions on Iran that would abrogate the agreement, said four people familiar with aspects of the president’s thinking.

All cautioned that plans are not fully set and could change.

The White House would not confirm plans for a speech or its contents. Trump faces an Oct. 15 deadline to report to Congress on whether Iran is complying with the agreement and whether he judges the deal to be in the U.S. national interest.

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“The administration looks forward to sharing details of our Iran strategy at the appropriate time,” said Michael Anton, spokesman for the White House national security council.

Other people familiar with the nine-month review of U.S. military, diplomatic, economic and intelligence approaches toward Iran spoke on condition of anonymity because aspects of the policy are not yet set and Trump has not announced his decision.

Trump’s senior national security advisers agreed within the past several weeks to recommend that Trump “decertify” the agreement at the Oct. 15 deadline, two of those people said.

That would start a 60-day congressional review period to consider the next steps for the United States.

On its own, the step would not break the agreement among Iran, the United States and other world powers, but would start a clock on resuming sanctions that the United States had lifted as its part of the deal.