European commission president Jean-Claude Juncker described the tariffs as "unjustified", and said it would hit back with its own tariffs and take the issue to the World Trade Organization.
Mexican Foreign Minister Luis Videgaray said the country will continue negotiating with the United States to revamp the North American Free Trade Agreement despite "unjust and unilateral" tariff measures by the US government.
"These tariffs are an affront to the long standing security partnership between Canada and the United States", said Trudeau, as Ottawa hit back with retaliatory duties on U.S. imports worth up to $12.8 billion.
These tariffs will harm industry and workers on both sides of the Canada-U.S. border, disrupting linked supply chains that have made North American steel and aluminum more competitive around the world.
Mexico: Its government said it would impose "equivalent measures" on U.S. products - including flat steel, lamps, pork legs and shoulders, sausages and food preparations, apples, grapes, blueberries, various cheeses, and more.
"It's entirely up to USA authorities whether they want to enter into a trade conflict with their biggest partner, Europe", France's Finance Minister, Bruno Le Maire, said after meeting with Mr Ross yesterday. The EU had previously released a list of USA products that would be subject to tariffs in the event the metal restrictions went into effect.
"It's entirely up to United States authorities whether they want to enter into a trade conflict with their biggest partner, Europe", France's Finance Minister Bruno Le Maire said after meeting with Ross on Thursday.
"Since President Trump stated his plans to impose blanket tariffs on steel imports nearly three months ago, the United Kingdom steel sector had hoped for the best, but still feared the worst". Europe, along with Canada and Mexico had been granted a temporary reprieve since President Trump first announced the tariffs in March.
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United Kingdom manufacturers exported more than £300m worth of steel to the USA past year.
The administration is taking the action under a relatively obscure USA trade law meant to protect national security.
A Commerce Department investigation earlier this year determined a need to ensure adequate USA steel production capacity to supply the military.
The tariffs have faced sharp criticism in the U.S. from businesses and lawmakers, including Republicans typically allied with the president. "We will also impose rebalancing measures and take any necessary steps to protect the EU market from trade diversion caused by these USA restrictions", said European Commissioner for Trade Cecilia Malmström. Emmanuel Macron spoke to Donald Trump on the phone on Thursday evening and called the American decision "illegal", the Elysee Palace said. But she said the Trump administration seemed determined to use the tariffs to demand unilateral concessions.
Australian delegations, headed by Prime Minister Malcolm Turnbull and Foreign Affairs Minister Julie Bishop, have aggressively lobbied the White House in recent months to secure the exemption.
"There was the broad lines of a decent win-win-win deal on the table", Trudeau said.
The EU, Canada, and Mexico took umbrage with the US's justification for the tariffs.
The Trump administration argues the tariffs are necessary to tackle overcapacity that is damaging U.S. steel manufacturers.