In doing so, Trump called it a awful deal that ultimately did nothing to stop Iran from developing nuclear weapons.
Kamalvandi said that Iran's report on the incident to the International Atomic Energy Agency had convinced everyone but "the USA, the Zionist regime and some Persian Gulf countries".
Acting IAEA chief Cornel Feruta, who will be succeeded by Argentina's Rafael Grossi next month, called Thursday's board meeting to discuss the incident and Iran's failure to give a convincing explanation for uranium traces found at a site in Tehran.
The current five percent level exceeds the limit set by the accord but is less than the 20% Iran had previously operated and far less than the 90% level required for a warhead.
On 7 November, Tehran began enriching uranium at the Fordow Fuel Enrichment Plant as part of the fourth stage of reducing its obligations under the JCPOA after Washington's withdrawal.
The EU and the U.S. called on Iran to cooperate with the IAEA in explaining the traces of uranium that was processed but not enriched.
The US left the agreement in 2018 and reimposed sanctions, leaving remaining world powers - Britain, China, France, Germany and Russian Federation - trying to save the agreement and mitigate the sanctions.
Tehran's envoy to the United Nations nuclear watchdog told reporters that, after going to the toilet while waiting for a further search, the inspector no longer showed positive traces, which prompted a further investigation.
As a result, she was denied entry, it added, without specifying whether or not anything had been found in her possession.
Reuters first reported on Wednesday that Iran had held an IAEA inspector and seized her travel documents in what appears to be the first incident of its kind since Iran's nuclear deal with major powers was struck in 2015.
Iran has accused its arch-foes Israel and the United States of mounting a long campaign of sabotage involving the assassination of Iranian engineers and cyber attacks on key facilities.
The inspector was allowed to leave Iran on 30 October, the memo obtained by Reuters said.
US Secretary of State Mike Pompeo on Friday slammed Tehran's treatment of an inspector with the UN's nuclear watchdog agency last week as "an outrageous and unwarranted act of intimidation".
IAEA spokesman Behrouz Kamalvandi told reporters on Thursday that Fordo's centrifuges will gradually increase in capacity until Saturday morning, when they will produce uranium enriched to 4.5%. This disagreement on interpreting the provisions of the resolution led U.S. President Donald Trump to call the JCPOA a "bad deal" before even entering the While House, and was purportedly one of the reasons why he finally withdrew from it in May 2018.