President Donald Trump left leaders at G7 Summit angry after he refused to sign the joint statement of world leaders, and accused the European Union for treating the United States as its own "piggy bank".
Trump's proposal was shocking, coming just days after he applied tariffs on steel and aluminum imports from the European Union, Canada, and Mexico. "He really, actually, you know what, he did a great disservice to the whole G-7".
The communique, which had appeared to have papered over the cracks that surfaced so uncharacteristically at the G7, said the leaders of the United States, Canada, Britain, France, Italy, Germany and Japan were agreed on the need for "free, fair, and mutually beneficial trade" and the importance of fighting protectionism.
After departing from the Quebec summit for Singapore, Trump tweeted that Trudeau's remarks at a news conference, where he said Canada would not be pushed around, "were very dishonest and weak".
May 31 - The Trump administration announces that Canada will no longer be exempt from steel and aluminum tariffs, prompting the Trudeau government to announce its own counter-measures.
He also says Canadians expect him to foster with Trump "a constructive, productive relationship in which we can work together, that is based on not insulting and disrespecting each other".
Hours after Mr Trump withdrew his support for the joint statement and attacked Mr Trudeau, Mr Kudlow and trade adviser Peter Navarro drove the message home on Sunday morning news shows in an extraordinary assault on a close U.S. ally and neighbour.
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"As far as this retaliation goes, the American press needs to do a much better job of what the Canadians are getting ready to do because it's nothing short of an attack on our political system and it's nothing short of Canada trying to raise its high protectionist barriers even higher on things like maple syrup and other goods", he said.
Kudlow sought to tie Trump's reaction to the upcoming summit with Kim Jong Un, saying the North Korean leader "must not see American weakness".
Trump had earlier called Trudeau's statement as "dishonest and weak".
In response to Mr Trump's decision to withhold United States support for the summit conclusions, a senior UK government source said: "We stand by the commitments made in the G7 communique". "Our Tariffs are in response to his of 270% on dairy!" "The Prime Minister said nothing he hasn't said before - both in public, and in private conversations with the President", the office added.
"I'm not so sure John's right about where America is on trade", Graham said on "This Week".
Mr Trump added: "Fair Trade is now to be called Fool Trade if it is not reciprocal".
Trump announced after Trudeau's press conference that the USA would not sign onto the G-7 communique.
But two sources with direct knowledge of the situation told CBC News that Canada has heard this kind of positive rhetoric from Trump before - without seeing results at the NAFTA negotiating table.
From Singapore early Monday, Trump continued to tweet that the United States protected North Atlantic Treaty Organisation countries "these same countries that rip us off on Trade".