By Jana Choukeir and Susan HeaveyDUBAI/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.U.S. Treasury chief Scott Bessent's comments on Thursday followed a warning from President Donald Trump of economic consequences against any country that provided "any type of lifeline to Iran." Bessent promised details on Monday.

Trump announces severe economic measures against Iran. Iran reconstruction funding in a U.S.-Iran deal by 2026 at 21.5% YES.

The announcement extends a pressure campaign the Trump administration has waged since April under the banner Operation Economic Fury.