Trump's Mexican tariffs test limits of U.S. emergency powers: legal experts

Trump dramatically intensified his quest to limit a wave of asylum seekers arriving at the U.S.-Mexico border, including families fleeing violence in Central America, by threatening to impose the tariffs starting on June 10.Financial markets reeled and business leaders on both sides of the border were taken by surprise, prompting discussions of legal action to curtail Republican Trump's use of a law never previously applied to impose tariffs.Jennifer Hillman, a Georgetown Law school trade law pr