Those, however, aren't specifically covered in the nuclear agreement. Iran's actions are "threatening the security of those in the region as well as the United States itself", he said.
More than 80 experts on nuclear non-proliferation issues urged the Trump administration Wednesday to not abandon the global agreement reached with Iran to curb Tehran's nuclear weapons development program.
Haley also brought up the importance of stopping Iran from exploiting "ambiguous language" in the deal, as well as IAEA's access to facilities in the Islamic Republic. The July 2015 deal was reached by Iran, the U.S., Britain, France, China, Germany and Russian Federation.
In a speech last month, U.N. Ambassador Nikki Haley made the case why the administration would be justified in decertifying Iran under the USA legislation.
Russian Federation and China have made clear they'd vehemently oppose any move to revisit the Iran deal, although US officials are betting they'd acquiesce if European allies join in pressing for action.
In addition, "sanctions never stopped Iran's nuclear program", argued Sherman, saying that the number of Iranian centrifuges grew to 19,000 under the old sanctions regime despite its crippling effect on the Iranian economy.
Iran, with its young population, "could be won over to a new way of thinking", Johnson said, adding that he has pushed that argument with Tillerson and other Americans. There have been reports that there's a debate going on within the Trump administration regarding whether to decertify.
Based on the Additional Protocol, the Joint Comprehensive Plan of Action (JCPOA), and the framework of cooperation between Iran and the IAEA, the United Nations nuclear watchdog can only inspect Iranian sites built for nuclear activities, Zarif told reporters upon his arrival in Russia's Sochi on Wednesday.
"Iran is subject to the world's most robust nuclear verification regime".
Iranian officials say just the opposite.
"The claim of such a right is fabricated by Mr. Amano", Velayati reportedly told Iranian state TV.
But on Tuesday, supreme leader Ayatollah Ali Khamenei's senior foreign affairs adviser, Ali Akbar Velayati, directly disputed that. Then, the president would make clear his readiness to hit Iran with a "de-facto global economic embargo" if it failed to meet certain conditions over a 90-day period, including opening military sites to worldwide inspectors.
Albright and Heinonen suggest that Iran may be in violation of some of these restrictions, and they argue that the IAEA should inspect Iranian military sites as a regular part of enforcing this part of the agreement, not treat such inspections as special cases used only in response to evidence of a specific violation.
Another option European officials said they would be willing to discuss would be not to reopen the JCPOA, but to explore prospects for trying to negotiate an additional agreement with Iran. Amano told reporters in Vienna this week that special access is already happening on a regular basis. It's unclear what kind of reason or evidence the IAEA would consider sufficient. "If the Trump administration loses this unprecedented access.it will soon wish for it".
The Trump administration is now reviewing US policy towards Iran, including the national security implications of the lifting of sanctions under the JCPOA.
Nauert did not specify which sanctions the administration had waived. "But I think the question becomes, even if that's their near-term strategy, whether it is politically sustainable over the long-term?"
If the United States doesn't certify Iran's compliance with the deal next month, "it will be viewed as the USA pulling out", Sherman said. But some worry it could provoke an Iranian reaction that would ultimately lead to the agreement's demise.
But first Trump must decide to extend sanctions relief to Iran under a separate clock. That would very likely shift the focus to Tehran - and to Congress, which could move to impose new sanctions on Iran.