U.S. National Security Advisor John Bolton issued a strong warning to Iran, saying that the Islamic Republic must change its behavior or there will be “hell to pay” if the regime continues its aggression.

“According to the mullahs in Tehran, we are the ‘Great Satan,’ lord of the underworld, master of the raging inferno, so, I might imagine they would take me seriously when I assure them today: If you cross us, our allies, or our partners; if you harm our citizens; if you continue to lie, cheat, and deceive—yes, there will indeed be hell to pay,” he said.

“The United States is not naive. We will not be duped, cheated, or intimidated. The days of impunity for Tehran and its enablers are over. The murderous regime and its supporters will face significant consequences if they do not change their behavior. Let my message today be clear: We are watching, and we will come after you,” he stated.

The harsh rhetoric from Bolton came just hours after U.S. President Donald Trump addressed the U.N. General Assembly, where he urged “all nations to isolate Iran’s regime as long as its aggression continues.”