In a speech opening a meeting of the IAEA's board of governors, the head of the UN's atomic watchdog said Monday, Iran is "implementing its nuclear-related commitments" under the deal , officially known as the Joint Comprehensive Plan of Action (JCPOA).
"The JCPOA represents a significant gain for verification," Amano said. "If the JCPOA were to fail, it would be a great loss for nuclear verification and for multilateralism."
U.S. President Donald Trump has threatened to pull out of the deal unless Congress and European allies help "fix" it with a follow-up agreement.
The IAEA, which is tasked with monitoring Iran's nuclear activities, has repeatedly verified Tehran's full commitment to its side of the bargain.
Iran and the P5+1 countries — namely the US, Russia, China, France, Britain, and Germany — finalized the nuclear accord in July 2015 and started implementing it in January 2016.
Under the deal, Iran undertook to apply certain limits to its nuclear program in exchange for the termination of all nuclear-related sanctions against Tehran.
The other parties to the accord -- Britain, Germany, France, Russia, China and the European Union -- have all reaffirmed their commitment to it and urged the United States not to back out.
