US National Security Adviser John Bolton has warned Iran’s rulers that there will be “hell to pay” if they harm the US, its citizens or allies.
His comments came hours after President Donald Trump accused Iran of sowing “chaos, death and destruction” across the Middle East.
Iranian President Hassan Rouhani responded by criticising the Trump administration for its hostility.
The US recently imposed sanctions after leaving the 2015 Iran nuclear deal.
The accord, negotiated by former President Barack Obama, saw Iran limit its nuclear activities in exchange for sanctions relief.
Mr Trump believes renewed economic pressure will force Iran to agree to a new deal.
What did the US say about Iran?
Mr Bolton said the “murderous regime” of “mullahs in Tehran” would face significant consequences if they continued to “lie, cheat and deceive”.
The former US envoy to the UN was speaking at an anti-Iran conference in New York on Tuesday.
“If you cross us, our allies, or our partners; if you harm our citizens,” he said, “there will indeed be hell to pay.”