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WASHINGTON, March 8-- U.S. President Donald Trump on Thursday formally signed proclamations to impose steep tariffs on imported steel and aluminum amid mounting dissent from business groups and trading partners around the world. The United States will impose a 25-percent tariff on imported steel and 10-percent on aluminum, Trump said at an event at the White House, noting a strong steel and aluminum industry is "vital to our national security." The tariffs will take effect in 15 days with initial exemptions for Canada and Mexico pending the renegotiation of the North American Free Trade Agreement (NAFTA). | 
