Iran vows 'devastating' response to US threat to cut off its economic lifelines

By Jana Choukeir, Eman Abouhassira and Susan Heavey DUBAI/WASHINGTON, Aug 21 (Reuters) - Iran said on Friday that its response to any new U.S. threats would be "devastating" after Washington pledged to impose the toughest financial penalties in history with the aim of toppling the Iranian leadership. Washington prepared for sanctions that U.S. Treasury chief Scott Bessent said he would detail on Monday. President Donald Trump earlier warned of economic consequences against any country that provided "any type of lifeline to Iran."