Iran warned Monday of a "crushing" response if the U.S. designates the country's Islamic Revolutionary Guard Corps a terrorist entity.
"We are hopeful that the United States does not make this strategic mistake", foreign ministry spokesman Bahram Qasemi was quoted as saying by the state news agency IRNA at a news conference.
Iranian President Hassan Rohani has warned of unspecified consequences if the United States leaves the accord, under which Tehran agreed to curtail its nuclear activities in exchange for relief from worldwide sanctions.
And Mohammad Ali Jafari, head of Iran's Islamic Revolutionary Guards Corp (IRGC), warned USA military forces could be in danger of an Iranian missile attack if Washington doesn't back down.
President Donald Trump is expected to announce this week, in conjunction with his administration's new approach to Iran, that the country is no longer in compliance with the Joint Comprehensive Plan of Action nuclear deal.
"If the news is correct about the stupidity of the American government in considering the Revolutionary Guard a terrorist group, then the Revolutionary Guard will consider the American army to be like Islamic State all around the world particularly in the Middle East", Jafari said.
Qassemi's remarks came in reaction to unconfirmed reports that US President Donald Trump is going to announce new measures against Iran, including the designation of the IRGC as a terrorist organization.
In an interview taped earlier this week and aired on October 7 on Trinity Broadcasting Network, Trump declined to specify his intentions in regard to the nuclear accord with Iran, but he said he is "very unhappy with the deal..."
"If reports on the U.S. decision to enlist Iran's IRGC as a terrorist group happen to be true, the Iranian force would also treat the American Army everywhere in the world and especially in the Middle East in the same way it deals with Daesh (ISIS) terrorists", Ali Jafari's said on Sunday. "I believe they're funding North Korea ... that doesn't pertain to the deal but, in my opinion, it does because it's called the spirit of a deal ..."
The Revolutionary Guard is Iran's most powerful internal and external security force.
Iranian Foreign Minister Mohammed Javad Zarif also said Iran would issue an "appropriate response" to the move, vowing that the IRGC would not stop its activity.
"If reports on the U.S. decision to enlist Iran's IRGC as a terrorist group happen to be true, the Iranian force would also treat the American Army everywhere in the world and especially in the Middle East in the same way as Daesh (IS) terrorists", he said.
Russian Federation has also warned the US against taking any action that would be viewed as hostile toward Iran.