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"He'll make that later this week," said White House spokesperson Sarah Sanders here on Tuesday at the daily briefing, Xinhua news agency reported.
"The President has reached a decision on an overall Iran strategy. He wants to make sure that we have a broad policy to deal with that, not just one part of it," Sanders added.
The nuclear deal was reached between Iran and the world six powers of Britain, China, France, Russia and the US plus Germany in July 2015.
In his speech delivered at UN General Assembly last month, Trump called the agreement "an embarrassment" for the US and indicated that he may not recertify the deal at its mid-October deadline.
The Trump administration is due to inform the Congress by October 15 whether Tehran is complying with the deal. If he decides it is not, it could open the way for US lawmakers to re-impose sanctions against Iran.