Donald Trump is expected to confirm shortly America’s intention not to recertifiy the agreement, which the US president previously condemend as the “worst deal ever”.
The USA will refuse to certify Tehran is complying with the deal, which was negotiated during Barack Obama’s reign and aimed to keep Iran’s nuclear programme under control.
It signals a more confrontational approach to Iran from Mr Trump, who has reluctantly rectified the deal twice despite concerns about loopholes.
The decision not to decertify the deal will not go down well in Iran, Europe or even Washington.
Senior US officials, European allies and prominent US lawmakers have told Trump that refusing to certify the deal would leave the America isolated, concede the diplomatic high ground to Tehran, and ultimately risk the unraveling of the agreement.

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Signed by the United States, Britain, France, Germany, Russia, China, the European Union and Iran, the deal relieved sanctions on Tehran in exchange for giving up its nuclear weapons program.
Mr Trump will also give the US Treasury Department broad authority to impose economic sanctions against people and entities in the Iranian military, the and the Iran Revolutionary Guard.
Rex Tillerson has admitted Mr Trump will push for separate measures against Iran but admitted they might struggle to secure the approval of Congress.
The US Secretary of State said: “What we are laying out here is this is the pathway we think provides us the best platform from which to attempt to fix this deal.
“We may be unsuccessful. We may not be able to fix it. And if we’re not then we may end up out of the deal.”
This is breaking story, more to follow…