While Iran has complied to date with its requirements under the nuclear deal, its support for terrorism has the US evaluating whether to continue lifting sanctions on its oil sector, US Secretary of State Rex Tillerson said.
"The Trump administration is now conducting across the entire government a review of our Iran policy", Tillerson said.
"The administration is doing an Iran review, but from what we hear the focus is more about what happens as parts of the deal expire, as opposed to actually opening the agreement up for renegotiation", the second diplomat said.
In a statement a short time ago, Secretary of State Rex Tillerson spoke as if Iran was violating the terms of the agreement, even though his own administration now admits the deal is working. He said the Trump administration has no intention of "passing the buck" on Iran to a future administration.
Iran has said many times that if the USA imposed additional sanctions, that would violate the nuclear deal and Iran would no longer feel bound by its terms.
U.S. Secretary of State John Kerry (L), U.S. Secretary of Energy Ernest Moniz (2nd L), Head of the Iranian Atomic Energy Organisation Ali Akbar Salehi (2nd R) and Iranian Foreign Minister Javad Zarif (R) wait with others ahead of a meeting at the Beau Rivage Palace Hotel in Lausanne on March 26, 2015.
And a nuclear-armed Iran could be very, very bad.
"Iran's nuclear ambitions are a grave risk to worldwide peace and security", he said.
He said: "The evidence is clear: Iran's provocative actions threaten the United States, the region, and the world".
Iran has supported the Syrian government during the conflict in that country, militias fighting ISIS in Iraq - including the Popular Mobilization Forces - and Houthi rebels in Yemen, as well as backed groups such as Hezbollah, a Lebanon-based militia.
With its latest test of a medium-range ballistic missile, Iran's continued development and proliferation of missile technology is in defiance of UN Security Council Resolution 2231.
As I indicated at the beginning, the Trump administration is now conducting a comprehensive review of our Iran policy. The administration says it is reviewing these accords and could still pull out of them. He pledged to "rip it up" if elected, a threat that was met with resistance from both proponents and opponents of the deal, and later said he would renegotiate it.
However, the U.S. admits that Tehran is complying with the 2015 agreement.
Earlier on April 19, U.S. Defense Secretary Jim Mattis said in Riyadh that Iran is playing a destabilizing role in the Middle East.
Those parties have been talking for some time to the United Nations watchdog International Atomic Energy Agency about clarifying various aspects of the deal that were ambiguous to ensure stricter implementation, the first diplomat said.