The tariffs are likely to go into effect on the European Union with an announcement by Friday's deadline, according to two people familiar with the discussions.
At a press conference Thursday afternoon, Canadian Prime Minister Justin Trudeau told reporters the US tariff actions against Canada are "totally unacceptable" and "an affront to the longstanding security partnership between Canada and the United States, and in particular.to the thousands of Canadians who have fought and died alongside their American brothers in arms".
"This doesn't happen that often at G7 meetings, but it was the USA against everyone else", Aso told reporters.
"Realistically, I do not think we can hope" to avoid either USA tariffs or quotas on steel and aluminum, said Cecilia Malmstrom, the European Union's trade commissioner.
Some people familiar with the matter have told Reuters that approval may depend on progress of broader talks and a reprieve from a US government ban on sales by USA companies to China's ZTE Corp, penalised for illegally supplying telecommunications gear to Iran and North Korea. "It's not that we can't talk just because there's tariffs", he said.
Japanese Finance Minister Taro Aso said Friday the US tariffs on steel and aluminum are "extremely regrettable", and that Tokyo could file a challenge with the World Trade Organization.
Fears of a global trade war are already weighing on investor confidence and could hinder the global economic upturn.
The European Union and the United States are so far on a collision course over steel and aluminum imports by the U.S. from the EU, with either tariffs or import restrictions becoming more likely by June 1.
Europe is expecting a decision from Trump during the day Thursday, French Finance Minister Bruno Le Maire said.
Italy's outgoing Premier Paolo Gentiloni on Thursday slammed the "unjustified" steel and aluminium tariffs to be imposed by the USA on Europe, Canada and Mexico at midnight.More news: Trump floats replacing NAFTA with bilateral agreements with Canada, Mexico
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"Unilateral responses and threats over trade war will solve nothing of the serious imbalances in world trade. Nothing", French President Emmanuel Macron said in an impassioned speech Wednesday.
In a clear reference to Trump, Macron added: "These solutions might bring symbolic satisfaction in the short term".
But Macron said those "who waged bilateral trade wars. saw an increase in prices and an increase in unemployment".
The move is likely to have an immediate impact on global trade in steel and aluminium, particularly between the U.S. and Canada, the largest supplier of imported steel to the US.
The administration's actions drew fire from Europe, Canada and Mexico and promises to quickly retaliate against USA exports. That hurts the companies and can lead to more expensive consumer prices, economists say.
Ross criticized the European Union for its tough negotiating position. But President Donald Trump has dusted them off in recent months and restored tariffs to a prominent place in his America First approach to the rest of the world. They report a really high surplus on trade with us.
The Mexican Government says it will levy import taxes on U.S. exports of pork bellies, apples, fruits and various types of steel.
"China's door for negotiation remains open", foreign ministry spokeswoman Hua Chunying said Friday. "It's not about who attacks whom, and then wait and see who is still standing at the end".
Ross expressed concern that the Geneva-based World Trade Organization and other organizations are too rigid and slow to adapt to changes in global business. "We are ready to rebuild this multilateralism with our American friends", he said.
Malmstrom is meeting U.S. Trade Representative Robert Lighthizer in Paris on Thursday among other worldwide trade chiefs.