A display featuring missiles and a portrait of Iranian Ayatollah Ali Khamenei is seen at Baharestan Square in Tehran, Sept. 27, 2017. Photo: Nazanin Tabatabaee Yazdi / TIMA via Reuters.

Iran‘s ambassador to the International Atomic Energy Agency on Friday rejected the UN atomic watchdog chief’s suggestion that reviving Iran’s nuclear agreement after a new US administration comes to power would require striking a new deal.

In an interview with Reuters on Thursday, Rafael Grossi, who heads the IAEA that polices Iran‘s compliance with the 2015 nuclear deal, said there had been too many breaches by Iran for the agreement to simply snap back into place when US President-elect Joe Biden takes office next month.

Biden has said the United States will rejoin the deal “if Iran resumes strict compliance.”

After President Donald Trump quit the deal in 2018 and reimposed US sanctions, Iran responded by breaching many of the deal’s restrictions.

“Presenting any assessment on how the commitments are implemented is absolutely beyond the mandate of the agency and should be avoided,” Kazem Gharibabadi, Iran’s ambassador to IAEA in Vienna, tweeted. “@iaeaorg played its part during negotiations on the JCPoA.”

Iranian President Hassan Rouhani, architect of the 2015 nuclear deal with six powers, has repeatedly said Tehran’s nuclear steps were reversible if the United States lifted sanctions and fully respected the pact.