"The deal is working, it is delivering on its main goal which means keeping the Iranian nuclear program in check and under close surveillance", Mogherini said after the meeting.
He also wants to give the International Atomic Energy Agency access to Iranian military sites, and for the deal to cover Iran's ballistic missile programme.
"The Trump Administration is deeply concerned by reports that the Iranian regime has imprisoned thousands of Iranian citizens in the past week for engaging in peaceful protests", the White House said in a statement.
Mr. Kamalvandi's comments came as European powers prepared to meet Thursday to reaffirm their support for the accord.
At a meeting in Brussels on Thursday Federica Mogherini, the EU's foreign affairs chief, said the bloc - as well as Britain, Germany, and France who signed the deal independently - were united in wanting to "ensure full and continued implementation" of the programme.
"Killing or sticking with the Iran deal isn't just about Iran".
Prior to that, the head of the Atomic Energy Organization of Iran, Ali Akbar Salehi, said on Monday that Tehran might reconsider its cooperation with the International Atomic Energy Agency if the USA reneged on sanctions relief.
The official told Reuters that Trump's top advisers were recommending that he extend Iran relief from sanctions.
In October, he refused to certify Iran was complying with the deal but stopped short of withdrawing from it, instead passing the issue of reimposing the sanctions to Congress. Some of those more targeted measures could be leveled against firms and individuals whose sanctions were scrapped in the 2015 accord. A snap-back on sanctions would cause the "dislocation of at least 500,000 barrels a day of Iranian crude oil exports, especially those going to Korea and Japan as well as to some European countries".
Hailed by Obama as key to stopping Iran from building a nuclear bomb, the deal lifted economic sanctions in exchange for Tehran limiting its nuclear ambitions. Furthermore, UANI calls on the European Union "to work with the United States to find solutions that hold Iran accountable for its reckless behaviour".
Another US official said Trump was expected by some officials to renew the sanctions waivers but stressed that no final decision had been made. Jack Straw, a former British foreign secretary, who returned from a trip to Tehran earlier this week, conceded the leadership appeared rattled.
Criticizing UN Security Council for holding a session on Iran's internal issues last week, Zarif said that the session was wrong by its very basis, but it displayed the USA isolation during the session with all other participating countries unanimously calling for implementation of the JCPOA. He said France remained dedicated to the agreement.