Iranian President Hassan Rohani said on Monday that U.S. President Donald Trump would regret it if he withdraws from a nuclear deal that Tehran and six world powers signed in 2015, as Iran's response would be stronger than imagined.
"Iran will not violate the nuclear deal, but if the United States withdraws from the deal, they will surely regret it. Our response will be stronger than what they imagine and they would see that within a week," Rohani said in a speech broadcast live on state television.
Rohani was speaking as Tehran marked National Nuclear Technology Day.
Trump has vowed to quit the nuclear deal. In January he said European allies must agree to "fix the terrible flaws" of the agreement - which was sealed under his predecessor Barack Obama - or he would refuse to extend U.S. sanctions relief on Iran.
Last month Britain, France and Germany proposed fresh EU sanctions on Iran over its ballistic missiles and its role in Syria's war in a bid to persuade Washington to preserve the nuclear accord.