Donald Trump announces his intention to withdraw from the JCPOA Iran nuclear agreement during a statement in the Diplomatic Room at the White House

Donald Trump must bring forward “concrete steps” for dealing with Iran’s nuclear ambitions after announcing he would pull the US out of the 2015 international agreement, Boris Johnson has said.

Speaking in the House of Commons, the foreign secretary said that while Washington’s continuing involvement in the deal would have been “the better course”, responsibility now lay with “the American administration to spell out their view of the way ahead”.

Mr Trump had committed himself to finding a new solution and MPs should take him “at his word”, Mr Johnson said. Mr trump later advised Iran not to restart their nuclear programme.

“In the meantime, I urge the US to avoid taking any action that would hinder other parties from continuing to make the agreement work in the interest of our collective national security,” he added.

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Mr Trump‘s announcement that he would pull the US out of the Iran nuclear deal was “silly and superficial”, Iran’s supreme leader said earlier, and contained “more than 10 lies”.

Ayatollah Ali Khamenei said on his official website: “He had maybe more than 10 lies in his comments. He threatened the regime and the people, saying you’re doing this and that. Mr Trump, I tell you on behalf of the Iranian people: You’ve made a mistake.”

Hard-line members of parliament also burned an American flag after Mr Trump called the nuclear agreement “rotten” and “defective at its core” – defying weeks of lobbying by France, Britain and Germany who had wanted him to remain in the pact.

“Trump does not have the mental capacity to deal with issues,” Iranian parliament speaker Ali Larijani said. The billionaire only understands the language of force and his decision to pull out of the agreement will isolate the US, Mr Larijani added.

Announcing his decision on Tuesday Mr Trump said he would re-impose sanctions on Iran to punish it for what he called “state-sponsored terror” in the Middle East.

“Any nation that helps Iran in its quest for nuclear weapons could be strongly sanctioned,” he added.

France called his withdrawal an “error” and said the US was not the “economic policeman of the planet”, while the country’s foreign minister, Jean-Yves Le Drian, insisted the deal was “not dead”.

Iran parliament reacts after Trump's withdrawal from nuclear deal Show all 10 1 /10 Iran parliament reacts after Trump's withdrawal from nuclear deal Iran parliament reacts after Trump's withdrawal from nuclear deal Iranian MPs burnt a US flag in parliament after Donald Trump announced America's withdrawal from the nuclear deal. AFP/Islamic Consultative Assembly News Agency Iran parliament reacts after Trump's withdrawal from nuclear deal US President Donald Trump displays a presidential memorandum after announcing his intent to withdraw from the JCPOA Iran nuclear agreement in the Diplomatic Room at the White House. Reuters Iran parliament reacts after Trump's withdrawal from nuclear deal Some Iranian MPs reacted after Trumps decision by shouting 'death to America'. AFP/Islamic Consultative Assembly News Agency Iran parliament reacts after Trump's withdrawal from nuclear deal Iranian lawmakers prepare to burn two pieces of papers representing the US flag and the nuclear deal. AP Iran parliament reacts after Trump's withdrawal from nuclear deal Iran said it will hold talks with signatories to the nuclear deal after Trump's decision to withdraw from the accord, which it branded "psychological warfare". AFP/Islamic Consultative Assembly News Agency Iran parliament reacts after Trump's withdrawal from nuclear deal Several Iranian MPs stood chanting in the Tehran parliament. AFP/Islamic Consultative Assembly News Agency Iran parliament reacts after Trump's withdrawal from nuclear deal Iranian MPs burning a US flag AFP/Islamic Consultative Assembly News Agency Iran parliament reacts after Trump's withdrawal from nuclear deal President Hassan Rouhani addressed the nation in a televised speech in Tehran. He said he'd send his foreign minister to negotiate with countries remaining in the nuclear deal after Trump's decision to pull America from the deal, warning he otherwise would restart enriching uranium "in the next weeks." Iranian Presidency Office via AP Iran parliament reacts after Trump's withdrawal from nuclear deal Iran's press condemned Trump's withdrawal from a multi-party nuclear deal but was divided over whether Tehran should react with patience or withdraw itself. AFP Iran parliament reacts after Trump's withdrawal from nuclear deal Trump announced the US withdrawal from what he called the "defective" multinational nuclear deal with Iran, and said Washington would reinstate sanctions against the Islamic republic. AFP/Getty

The leaders of the UK, France and Germany said they had a “continuing commitment” to the deal. Emmanuel Macron is to speak with Iranian president Hassan Rouhani on Wednesday and urge him to keep to its terms.

In a tweet, he said “the nuclear non-proliferation regime is at stake”, and Mr Le Drian added that there was now a “real risk” of confrontation in the region.

Mr Trump’s decision was unpopular at home, a poll released on Tuesday suggested. Fewer than one in three Americans agreed with pulling out of the Iran nuclear deal, with 42 per cent explicitly against the move and 29 per cent in favour; 28 per cent did not register a preference.

Israel’s Benjamin Netanyahu, however, backed Mr Trump and said he had shown “courageous leadership”. “The deal didn’t reduce Iran’s aggression. It dramatically increased it,” he added.

China urged all parties to stick to the deal, to which it, along with Russia and the three European countries, are party.