Mexico has become the latest country to take the United States to the World Trade Organization over Washington's steel and aluminum tariffs. <br /> Mexico's economy ministry said Monday it was starting the dispute settlement process because the U.S. was violating WTO rules.<br />Washington imposed a 25 percent tariff on steel imports and 10 percent tariff on aluminum imports from Mexico, Canada and the EU last week.<br />Ottawa and Brussels have already filed complaints with the WTO and all three nations have announced retaliatory measures against American goods.<br />The EU also said it could impose preliminary measures to safeguard its steel and aluminum industries as early as next month.<br /> Meanwhile, President Trump took aim at China and Canada again in a series of tweets on Monday.<br />He said China's taxing on American soybeans and Canada's trade barriers on agricultural product were not acceptable. <br />
