European diplomats and U.S. analysts predicted that Trump would continue to waive the sanctions that were suspended as part of the deal, while imposing new sanctions on other grounds, like human rights or missile development.
In a telephone call with Trump on Thursday, French President Emmanuel Macron stressed the importance of abiding by the nuclear deal and, in an apparent effort to win the USA president over, emphasized the need to enforce it rigorously.
In one possible compromise, Mr Trump could choose not to reimpose the sanctions that were eased under the nuclear deal but punish Iran on other matters.
Officials in the Trump administration have suggested that Trump plans to extend the waivers that lifted sanctions on Iran, but could seek new measures over issues such as human rights issues and missile programs.
Under the deal, Iran would need roughly a year, instead of less than two months, to produce enough fissile material for a nuclear weapon, giving the worldwide community enough time to detect any major clandestine nuclear effort, said the report, which is co-authored by the Carnegie Endowment for global Peace and Center for a New American Security.
Nearly all the U.S. sanctions waived under the JCPOA are "secondary", meaning they would target any foreign company that did business with proscribed Iranian institutions or firms.
Trump also faces a deadline Friday to say whether he will "certify" to Congress that Iran is complying with the deal and that it remains in US interests to adhere to it. Trump declined to make that certification in October, throwing the deal into limbo but not breaking it outright.
He accused Iran of "not living up to the spirit" of the agreement even though the International Atomic Energy Agency says Tehran is complying. This would be a very powerful gesture that fulfills his campaign promise to make America safe again. He has particularly bristled at having to give Iran a "thumbs up" every few months by acknowledging that it is meeting the requirements to invest in foreign banks, sell petroleum overseas, buy USA and European aircraft, and so forth. It has now been almost 90 days since Trump's October 13 decertification, and he is scheduled to report on Iranian compliance and American national security issues once again on Friday. New sanctions will not help their economic problems.
Syrian leader Bashar al-Assad may have enjoyed a good chuckle over an Iranian official's warning on Monday.
Trump allowed the deal to remain in place past year while Congress considered legislation to strengthen the 2015 agreement. To hear one senior European official tell it, "Trump keeps poking and prodding Tehran to do something stupid, but the Iranians are too smart to fall for it". Currently, Congress must act for the sanctions to snap back.
Another proposal would require snapback if Iran refuses a request from the International Atomic Energy Agency (IAEA), the UN's atomic watchdog, to inspect a military site not now being monitored.
Other debates center on Iran's missile testing.
MARTIN: The deadline for reimposing these sanctions on Iran is tomorrow.
However, Trump, who has vowed to scrap the pact, was expected to give the US Congress and European allies a deadline for improving it, the person said. "It's probably his best strategy".