"It is vital that we continue to work with our European partners to preserve the Iran deal, and with it the security and prosperity it is bringing to the people of Iran and the world".
Mr. Trump faces a January 12 deadline to extend waivers of broad oil and energy sector sanctions that were critical in getting Iran's commitment to the Obama-era accord.
"The deal is working, it is delivering on its main goal which means keeping the Iranian nuclear programme in check and under close surveillance", Mrs Mogherini said.
Mr. Kamalvandi's comments came as European powers prepared to meet Thursday to reaffirm their support for the accord.
"We should separate two things from each other: we want to preserve the nuclear deal with Iran... and the hard role Iran has in the region", Gabriel said before a meeting with his counterparts from Iran, Britain, France and the EU's top diplomat.
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As the deadline for U.S. President Donald J. Trump to reject or reinstate the Iran nuclear deal approaches, European leaders will demonstrate support for the pivotal nuclear deal that limits Iran's nuclear energy programme during talks in Brussels on Thursday.
And there's a warning that if Trump reimposes sanctions, the pact could fall apart.
On the other hand, Iran's threat also exposes some of the deal's shallowness and therefore the need for the deal to be modified.
The 2015 deal stipulates that the White House must make a decision every four months on whether to keep the broad-based sanctions waivers in place.
According to two United States sources, Trump had not made a decision by Wednesday, while Johnson told the British parliament on Tuesday that London was urging "our friends in the White House not to throw it away".
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The official told Reuters that Trump's top advisers were recommending that he extend Iran relief from sanctions.
The decision comes as Iran's government deals with protests over economic hardships and corruption that are linked to frustration among younger Iranians who hoped to see more benefits from the lifting of sanctions. Furthermore, UANI calls on the European Union "to work with the USA to find solutions that hold Iran accountable for its reckless behaviour". A third United States official said Trump was expected by some officials to renew the sanctions waivers but stressed that no final decision had been made.
But he will also use the meeting to raise the issue of Zaghari-Ratcliffe and other dual-national consular cases with Tehran's foreign minister Mohammad Javad Zarif.
Iran, which on Monday warned the world to get ready for Washington abandoning the deal, has said if the USA walks away from the agreement it is ready to give an "appropriate and heavy response".
Such measures, said Mr. Zarate, "would be consistent with the agreement's allowance for the application of non-nuclear sanctions".
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