U.S. Presidential nomineeDonald Trump walks past a Mexican flag after giving a press conference with Mexico's President Enrique Pena Nieto at the Los Pinos residence in Mexico City, Mexico, August 31, 2016.
The tariffs - 25 percent on steel and 10 percent on aluminum - will take effect at midnight Thursday, marking a major escalation of the trade war between the us and its top trading partners.
Mr Stace said United States tariffs would be "purely protectionist".
The Trump administration wants the European Union to cut back on its metals exports to the U.S.
Outside of just the beer industry, multiple studies estimated that the steel and aluminum tariffs would result in a net loss of USA jobs and hurt the domestic economy. "This is protectionism, pure and simple", Juncker said.
Mr Stace admitted that there was a problem of global over-capacity in the steel industry, but said most of that was in China. Ross denied this impression and said that there has been transshipment of Chinese steel and aluminum. U.S. Steel (X) rose 3.6%, Steel Dynamics (STLD) pulled back to a 0.6% gain.
The US is also engaged in negotiations with the US and Canada with the goal of updating the North American Free Trade Agreement (NAFTA).
Other countries like Australia and South Korea have won permanent exemptions to the tariffs because they've agreed to quotas.
Canada, Mexico and the European Union were among the countries granted relief while the United States pursued negotiations to address the administration's concerns about the state of domestic steel and aluminum production.
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"Those talks are taking longer than we had hoped".
The Commission will also immediately begin a dispute settlement with the World Trade Organisation.
President Donald Trump's administration has threatened to impose tariffs on vehicle imports, is engaged in negotiations with China to reduce America's yawning trade deficit and has said it will punish Beijing for stealing its technology by imposing tariffs on $50 billion of imports from China.
"If any of these parties does retaliate that does not mean there can not be continuing negotiations", Ross said.
The Trump administration announced the tariffs in March citing the need to protect U.S. steel and aluminium producers for national security reasons. European officials argue that tit-for-tat tariffs will hurt growth on both sides of the Atlantic and Canada said before the announcement that it would respond in kind.
While not confirming directly that the USA would decide to impose tariffs, he said: "It's up to the European Union to decide if it wants to take retaliatory measures".
More than 60 percent of U.S. auto imports - an industry that closely binds USA and Canadian manufacturing - come from G7 countries, as well as more than 50 percent of aluminium imports and almost 36 percent of steel. But they can increase costs more broadly for US manufacturers that cannot source all their needs locally and have to import the materials.