President 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 U.S. 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.