FNA- Iranian Foreign Ministry Spokesman Bahram Qassemi blasted US Secretary of State nominee Rex Tillerson for his remarks against the internationally-accepted nuclear deal between Tehran and the world powers, and said the agreement would never go under renegotiation.

"The Joint Comprehensive Plan of Action (JCPOA) is an international agreement between Iran, the Group 5+1 (the US, Russia, China, Britain and France plus Germany) and the EU which has also been approved by the UN and it is not a deal merely between Iran and the US," Qassemi told FNA on Saturday.

He said the nuclear agreement cannot be reviewed again, and stressed that even thinking about making any change in it is "impossible".

Qassemi addressed Tillerson, and said a person who has not yet been entrusted with an official responsibility had better think about the JCPOA and the consequences of his remarks so that he will not be forced to change them in later stages.

If he is approved as Secretary of State, Rex Tillerson said he would plan a "full review" of the international accord.

But appearing before the Senate Foreign Relations Committee, Tillerson did not promise to rip up the deal, as President-elect Donald Trump sometimes has said he would do.

Tillerson said he would increase monitoring and verification systems to ensure Iran does not violate the agreement, which eased international sanctions against the country.

His comments came after Iranian Deputy Foreign Minister for Legal and International Affairs Seyed Abbas Araqchi underlined earlier this month that his country is serious about reciprocating the US violation of the 2015 nuclear deal, saying that Washington has received Tehran's message.