On Tuesday, US President Donald Trump had announced that the country was withdrawing from the 2015 deal and will impose "the highest level" of economic sanctions on Tehran in order to stop Iran's so-called efforts to make nuclear weapons.
The statement called on the United States to ensure that the structure of the deal stay intact and "avoid taking action which obstructs its full implementation by all other parties to the deal".
The Trump administration took issue with various aspects of the deal, including its failure to address Iran's ballistic missile program and the deal's sunset provision loosening restrictions in the next decade.
Trump announced on Tuesday that the USA was withdrawing from the Iran nuclear deal, adding the U.S.
Former CIA director John Brennan said Trump's "madness" had "undermined global confidence in United States commitments, alienated our closest allies, strengthened Iranian hawks, & gave North Korea more reason to keep its nukes".
EU Commission President Jean-Claude Juncker said in a speech to a Belgian regional parliament that Trump's decision shows the U.S.
The worst case is war in the Middle East or a nuclear-armed Iran that is willing to strike at America.
Last month, he said the deal allowed for "pretty robust" inspections of Iranian facilities.
Trump's decision may not crimp Iranian oil exports in the short run.
On Wednesday, Trudeau said the Iran nuclear deal wasn't ideal, but it helped prevent that country from developing a nuclear weapon. While Iranian officials, including the parliament speaker, say they hope Europe will work with them to preserve the deal, many are pessimistic.
Meanwhile, Congressman Brendan Boyle, one of Irish America's leading voices in Washington and a member of the House Foreign Affairs Committee, expressed his opposition to President Trump's decision.
While uncertainty remained over consequences for trade with Iran, Mr Parker said the government was aware of the complexities approaching and the budget specifically allocated more money to the ministry.
French President Emmanuel Macron, who personally lobbied Trump to remain in the deal, said: "France, Germany, and the United Kingdom regret the USA decision to leave the JCPOA". Robert Menendez was one of only four Democrats to oppose Barack Obama's nuclear deal with Iran.