In a public Facebook post, Barack Obama wrote:

Fourth, Iran is complying with the JCPOA. That was not simply the view of my Administration. The United States intelligence community has continued to find that Iran is meeting its responsibilities under the deal, and has reported as much to Congress. So have our closest allies, and the international agency responsible for verifying Iranian compliance – the International Atomic Energy Agency (IAEA).

Is this true, or has Iran violated the nuclear deal?

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    I found an article from Politifact indicating that Iran had a couple of minor violations, but quickly rectified them. As a result, a statement like, "Iran is in compliance," was reasonable. However, this was written a year ago. Is it still an accurate picture of the situation? – Kevin May 10 '18 at 20:41
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    Quick searches online only show the Heavy Water limits being exceeded a couple times, and both times before the last time Trump re-certified the Iran deal. John Bolton has claimed there are violations, but refuses to cite any besides the HW limit breaches, only saying "there were other breaches than that". – DenisS May 10 '18 at 21:15
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    The headline claims from the Trump administration were that Iran was doing a bunch of other bad things not that the core treaty had be violated. They wanted the treaty to be broader in constraining Iran; they didn't claim it had been violated as such. – matt_black May 12 '18 at 11:35
  • @matt_black Honestly, that's a big part of the reason I quoted Obama instead of someone from the Trump camp. It was easier for me to find a notable claim saying that Iran was in compliance than it was to find a claim that it wasn't. – Kevin May 15 '18 at 20:57
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    @KDog I would say that most of the nations in Western Europe are closer allies than Israel. – Kevin May 19 '18 at 0:34

According to the IAEA: Iran is compliant.

The IAEA issued this statement by its Director General Yukiya Amano on 2018-05-09:

The IAEA is closely following developments related to the Joint Comprehensive Plan of Action (JCPOA). As requested by the United Nations Security Council and authorised by the IAEA Board of Governors in 2015, the IAEA is verifying and monitoring Iran’s implementation of its nuclear-related commitments under the JCPOA. Iran is subject to the world’s most robust nuclear verification regime under the JCPOA, which is a significant verification gain. As of today, the IAEA can confirm that the nuclear-related commitments are being implemented by Iran.

Also: If the USA has proof of violations it should submit this proof to the IAEA and the UN security council (the JCPOA was endorsed by the UN Security Council).

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Obviously, Iran could be out of compliance and hiding it so well no one else knows. Here, however, is what the US Government has to say:

Secretary of State Mike Pompeo [and recent director of the CIA – AL] had said in recent weeks that there was no evidence that Iran breached the deal. “I’ve seen no evidence that they are not in compliance,” Pompeo told the Senate recently.

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It is the US administration, among other signatories, that certifies compliance. Acording to US Law, the President is in fact required to do so every 90 days:

Per the Iran Nuclear Review Act of 2015, the Trump administration is required to certify to Congress every 90 days that Iran is in compliance with the July 2015 nuclear deal (the Joint Comprehensive Plan of Action, or JCPOA) and that this agreement is in the national-security interests of the United States.

The IAEA, as claimed in the accepted answer, does not certify compliance

These accounts are false. In fact, the IAEA has never certified Iran’s compliance with the Joint Comprehensive Plan of Action (JCPOA). Rather, the IAEA’s mandate with respect to the JCPOA primarily entails monitoring and reporting on Tehran’s nuclear-related actions (or lack thereof) pursuant to the JCPOA’s provisions. The determination of whether Iranian conduct constitutes compliance with the JCPOA remains the prerogative of the individual parties to the agreement: China, France, Germany, Russia, the United Kingdom, the United States, and Iran, with the high representative of the European Union for foreign affairs and security policy


...has proclaimed it will not permit inspections of its military bases, which are permitted—indeed necessary—under the nuclear deal.

In prepared remarks on deciding to decertify Iran, Trump said

Iran failed to meet expectations in its operation of advanced centrifuges and intimidated international inspectors into not using their full authority.

There is also significant cause to believe that the IAEA has been severely compromised and is not acting dutifully to their mandate:

It is also necessary to investigate the conduct of the IAEA, which was obligated to act an independent professional body not subject to political pressure, but wrote its reports of inspections in consultation with the party under investigation, that is, Iran. The conduct of IAEA director-general Amano must be examined, since he agreed to a scandalous, unprofessional, and unreliable inspection procedure at the Parchin military site; also there must be an examination of the IAEA's claim that it was impossible to determine with certainty that the suspect activity was carried out by the Iranian regime.

The Trump administration duly decertified Iran

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    -1 While I don't necessarily doubt that this might be correct, this answer could really use some quotes from the links (and ideally better sources). The original source for your first link is this letter from four Republican senators. They in turn seem to provide sources for two out of their four claims (which I would suggest to follow up on for a decent answer). I'm not sure how your second link is relevant, quotes would really help here. – tim May 13 '18 at 16:13
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    The Iran Nuclear Review Act which requires the US President to verify the deal every 90 days is an internal US political thing. The JCPoA agreement between the various nations does not give the US the sole responsibility of determining compliance: it created the Joint Commission of 8 countries to oversee compliance with the deal. – PhillS May 13 '18 at 17:17
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    Paragraph ix of the "Preamble and General Provisions" of the JCPoA document describes in outline the Joint Commission and its role in verifying compliance. Paragraph x also describes a time for the IEAE). Annex 4 of the JCPoA gives more detail on the Joint Commission formation and activities and (for examine) how disagreements are to be handled. You won't find anything in the JCPoA text assign any kind of role to the US president. – PhillS May 14 '18 at 19:29
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    The IAEA exists for a reason. Iff the US administration had proof of violations of the JCPOA, it should submit that to the IAEA and the UNSC (and the public). So far it hasn't done that. – Martin Schröder May 15 '18 at 9:19
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    @KDog: AFAIK that wasn't any data on violations of the JCPOA, only (very) old data. Oh, and Israel is not a party of the JCPOA. – Martin Schröder May 16 '18 at 12:26

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