"We think that the G7 (meetings) will be useful if at the end of the G7, the United States is aware of the possible negative consequences of their decision on the unity of the G7 - not only the economic unity, but also the political one", Mr Le Maire said.
He said the focus now is to use the threat of retaliatory measures to pressure the U.S. into reconsidering its own tariffs before any negative economic impact actually materialises.
"The leaders expressed their strong concerns and deep disappointment with the imposition of USA tariffs on Canadian and Mexican steel and aluminum exports", Trudeau's office said in a summary of the phone call with the Mexican leader.
President Donald Trump suggested Friday the United States might pursue separate free trade agreements with Canada and Mexico to replace the 24-year-old three-nation NAFTA pact. It highlights trade relationships between Canada and six states of the southern United States.
Kudlow added, "To say that it is an attack on Canada is not right".
He further said that the retaliatory tariffs would only be applied to USA goods and would come into effect from July 1.
"But if you take the European Union and you see the kind of tariff they charge, and then we don't, that's called "not fair trade". He added: "This is a trade dispute, if you will". Well, they have a 2 billion surplus on steel with us.
They agreed at the meeting in the Canadian ski resort of Whistler that the issue will be discussed at the G-7 summit to be held in Charlevoix from Friday to Saturday where "decisive action is needed".
Britain's International Trade Secretary Liam Fox said Theresa May would use the meeting to try to convince Mr Trump to back down from what he called an "illegal" maneouvre by the US.
"And that's why I regard this as more of a family quarrel. We're that interconnected, so we want a win/win, and that's what we've been working toward".
Mr Le Maire said it is up to the USA to take action to rebuild confidence among G7 members and to avoid any escalation during the leaders' summit next week.
On Monday, the 11th annual Southeastern U.S.
Canada's Prime Minister Justin Trudeau has said the U.S. imposition of tariffs on metal imports is an insult to their long standing security partnership, Press TV reports. The Trump administration is offering a process in which individual companies can apply for exemptions, and Zive says that the new tariffs will lead to thousands of such requests.
Freeland said Canada's reciprocal tariffs, outlined last week, were "the strongest trade action Canada has taken since the second world war".
Trudeau said he refused to go because of the "totally unacceptable" precondition. Mexico, the US President said, had taken US vehicle companies, a big percentage of them.