America's allies see the accord as the best way of thwarting Iran's quest for nuclear arms and a victory for multilateral diplomacy.
The Islamic Republic of Iran and the global community have said that the JCPOA is an worldwide valid document and is non-renegotiable under any circumstances. Iran insists its nuclear programme is only for peaceful purposes.
Sanders did not say when an announcement would be made. Work already has begun on this front, the official said.
By thus "decertifying" the arrangement, he opened a window for Congress to reimpose sanctions, but to date, it has not done so - leaving the issue of the waivers.
The Iranian nuclear deal was drawn up in 2015 under former President Barack Obama, with Iran, the USA and five other nations.
That balance is aimed at satisfying Trump's demand to raise pressure on Iran, while not embarking on a frontal assault on the most central trade-offs of the nuclear agreement.
Trump plans to negotiate a separate agreement to address flaws he says exists in the Joint Comprehensive Plan of Action (JCPOA), the official name for the 2015 agreement. French President Emmanuel Macron stressed to Trump in a telephone call on Thursday the importance of abiding by the deal.
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One of the reports will likely extend the number of Russian officials and companies on the sanctions list, while the other will analyse whether sanctions so far have proved to be effective, Ryabkov said.
But Washington also announced sanctions against 14 entities and people, including the head of Iran's judiciary, Ayatollah Sadeq Larijani.
Chinese Foreign Minister Wang Yi told Iranian Foreign Minister Mohammad Javad Zarif by phone that implementation of the deal had not been "derailed" but would face "some new complicating factors", the state news agency Xinhua reported.
It saw Iran agree to drastically reduce uranium enrichment activity, dispose of its enriched uranium stocks and modify a heavy water facility so it could not produce material suitable for a nuclear bomb.
The agreement, she said, is "making the world safer and. preventing a potential nuclear arms race in the region".
A decision to withhold a waiver would have effectively ended the deal between Iran, the United States, China, France, Russia, Britain, Germany and the European Union.
"We are gradually coming to the conclusion that an internal decision by the USA to leave the (Joint Comprehensive Plan of Action) has already been made or is close to being made", Russian Deputy Foreign Minister Sergei Ryabkov said in an interview with Interfax news agency. JCPOA is not renegotiable: "rather than repeating exhausted rhetoric, U.S. must bring itself into full compliance-just like Iran", he wrote.
"The Iran deal in its current form is unacceptable and is simply not working", Mr. Gardiner said.