The Trump administration on Monday launched what it described as an unprecedented economic offensive against Iran, unveiling a sweeping package of sanctions, enforcement measures and diplomatic pressure aimed at cutting off the Islamic Republic's remaining financial lifelines. Treasury officials said the initiative, dubbed "Operation Economic Outcast," would target countries, companies and individuals that continue doing business with Tehran while expanding sanctions authorities across key sectors of Iran's economy. "Let there be no ambiguity as to the position of the United States: economic engagement of any kind with this murderous regime will expose those responsible to the full reach of American…