Trudeau said he had told Trump "it would be with regret but it would be with absolute clarity and firmness that we move forward with retaliatory measures on July 1, applying equivalent tariffs to the ones that the Americans have unjustly applied to us". He also said that because of Trudeau's comments, he instructed USA trade representatives to not sign the communique the G-7 leaders had agreed upon expressing the need for "free, fair, and mutually beneficial trade".
Trump, after announcing the tariffs, sends message to Trudeau about NAFTA talks on May 31 - "Earlier today, this message was conveyed to Prime Minister Justin Trudeau of Canada: The United State (sic) will agree to a fair deal, or there will be no deal at all".
A recently-released annual report on North Atlantic Treaty Organisation spending showed that the overall defense spending by member states has been on the rise for the second year in a row, with European nations, as well as Canada, upping their contributions.
He said Trump "did the courtesy to Justin Trudeau to travel up to Quebec for that summit".
The US president, who is in Singapore for a landmark summit with North Korean leader Kim Jong-un, tweeted on Monday that America was paying disproportionately more towards the costs of the North Atlantic Treaty Organisation (Nato) than fellow members.
And he launched a broadside at Angela Merkel's government, saying: "Germany pays 1% (slowly) of GDP towards North Atlantic Treaty Organisation, while we pay 4% of a MUCH larger GDP".
"Change is coming!" he warned.
Trump is being accused by some of upending "two days of global economic diplomacy" after he tweeted that the United States should not sign the G7 Communique that Canada's Prime Minister Justin Trudeau said had been agreed upon in Quebec.
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In his earlier interview, Kudlow said he personally negotiated with Trudeau during the two-day G7 summit in Quebec and insisted the USA agreed to the language in the communique in good faith. "As Canadians, we are polite, we're reasonable, but also we will not be pushed around".
Mr. Trudeau, along with other leaders of the G-7, have criticized Mr. Trump's proposed tariffs on steel and aluminum to stop the allies from taking "advantage" of the U.S. Kudlow suggested Trump saw Trudeau as trying to weaken his hand before that meeting, saying the president won't "let a Canadian prime minister push him around".
French President Emmanuel Macron said "international co-operation can not be dictated by fits of anger and throwaway remarks".
"The historic and important agreement we all reached" at the summit "will help make our economies stronger and people more prosperous, protect our democracies, safeguard our environment, and protect women and girls' rights around the world".
Trump had set a very confrontational tone ahead of the summit by slapping tariffs on steel and aluminium imports from Canada and the European Union, and calling for Russian Federation to be let back into the summit.
On 1 June, the U.S. imposed a 25% tariff for steel and 10% for aluminium on imports from the European Union (EU), Canada, and Mexico. We're like the piggybank that everybody is robbing.
The EU then announced retaliatory tariffs on U.S. goods ranging from Harley-Davidson motorcycles to bourbon.
He called Canada's actions a "betrayal".