Tillerson told Speaker of the House Paul Ryan in a letter late Tuesday that Iran is complying with the Obama-era agreement to freeze its nuclear program in exchange for sanctions relief but warned that, "Iran remains a leading state sponsor of terror through many methods and platforms".
He did not say how long the review would take but said in the letter to Ryan that the administration looked forward to working with Congress on the issue.
Tillerson further repeated a defunct U.S. accusation that Iran's nuclear program is not peaceful, claiming that the deal "only delays their goal of becoming a nuclear state".
Douglas Brinkley, a presidential historian at Rice University, said Trump may be allowing himself to argue in the future that existing deals can be improved without being totally discarded.
President Trump has described the landmark agreement as the "worst deal ever".
Zarif said in a tweet that the US should "fulfill its own commitments", in response to a comment from US Secretary of State Rex Tillerson.
The nuclear deal was sealed in Vienna in July 2015 after 18 months of negotiations led by former Secretary of State John Kerry and diplomats from the other four permanent members of the UN Security Council - Britain, China, France and Russian Federation - and Germany.
Under the deal, the State Department must notify Congress every 90 days on Iran's compliance under JCPOA. That agreement, he said, "fails to achieve the objective of a non-nuclear Iran". The Trump administration has repeatedly said that it is hoping that China will do for Mr. Trump what it has failed to do for past presidents - force concessions from Pyongyang.
UK Labour leader Jeremy Corbyn comes out fighting ahead of election
Corbyn has criticised her apparent u-turn on a snap election , as May previously insisted there would be no vote before 2020 . And Labour in this election will be part of a movement of the British people to make that change .
Israeli Prime Minister Benjamin Netanyahu has criticized the deal.
And even if the United States does not reimpose the nuclear sanctions that it dropped under the deal, it could impose penalties on Iran for its alleged sponsorship of armed "terrorist" movements in other countries.
He has also said that USA confirms Iran is fulfilling its obligations under the deal, but believes that the country is supporting terrorism.
Should the United States break the terms of the agreement, it would upset the other partners of the deal, which was signed in July 2015 - and Iran could consider the move a green light to restart its nuclear activity.
Voronkov also stated that United States economic sanctions against Iran "create an unfavorable climate".
The official concluded, "I'm not sure that's a compelling case to stay in the JCPOA and continue to provide the sanctions relief that is fueling Iran's belligerent and unsafe behavior".
The White House is conducting a comprehensive review of the nuclear deal and will then meet the challenges with "clarity and conviction".
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