Iranian President Hassan Rouhani has warned that america will face "historic regret" if Donald Trump scraps the nuclear settlement with Tehran.
Mr Rouhani's feedback come as the us president decides whether or not to drag out of the deal via a 12 may closing date.
Mr Trump has strongly criticised the agreement, calling it "insane".
The 2015 deal - among Iran, the us, China, Russia, Germany, France and the United Kingdom - lifted sanctions on Iran in return for curbs on its nuclear programme.
France, the United Kingdom and Germany were trying convince the usa president that the contemporary deal is the great way to prevent Iran growing nuclear guns.
what's the Iran nuclear deal?
Is Iran's financial system higher off since the nuclear deal?
could the deal fall apart?
British overseas Secretary Boris Johnson is travelling to Washington on Sunday to talk about the problem with White house officials.
The UN additionally warned Mr Trump no longer to walk away from the deal.
expertise, he has threatened that the us will "withdraw" from the deal on 12 may additionally - the stop of a 120-day assessment period - until Congress and eu powers fixed its "disastrous flaws".
In comments carried stay on Iranian kingdom tv on Sunday, President Rouhani stated: "If the united states leaves the nuclear deal, this could entail historic regret for it."
He warned Iran had "a plan to counter any choice Trump might also take and we can confront it".
Iran insists its nuclear programme is totally non violent and says it considers the deal non-renegotiable.
remaining week, Israel revealed "mystery nuclear files" which it said showed Iran had run a clandestine nuclear guns programme before 2003, and had secretly retained the technological bdd5b54adb3c84011c7516ef3ab47e54, in breach of the agreement.
Iran branded Israeli prime Minister Benjamin Netanyahu a liar and stated the documents he produced have been a rehash of old allegations already dealt with by the global Atomic power company (IAEA), the UN's nuclear watchdog.
knowknowledge US Secretary of nation Mike Pompeo stated the documents had been authentic and showed the 2015 Iran nuclear deal turned into "built on lies".
Mr Trump is already unhappy that the modern-day deal most effective limits Iran's nuclear sports for a set duration and does not stop the development of ballistic missiles.
He additionally said it had surpassed Iran a $100bn (£72bn) windfall that it used "as a slush fund for weapons, terror, and oppression" across the center East.
economic assets frozen by means of sanctions had been back to Iran beneath the phrases of the deal. Iran has continually denied US claims that it sponsors militant corporations.