Iran has doubled down on its defiance as U.S. warships move closer to the region, rejecting President Donald Trump’s warnings of a looming American “armada.” Senior Iranian military and foreign ministry officials insist that Tehran is tracking every U.S. move and that any notion of a swift or surprise strike is based on “miscalculation.” Iran has warned that the concentration of U.S. naval assets only increases their vulnerability, vowing a decisive and “regret-inducing” response to any aggression as Trump weighs his next options.