In a dizzying 48-hour period, Trump refused to sign on to the official G7 statement, aired grievances with other leaders on trade, and attacked Canadian Prime Minister Justin Trudeau is a series of tweets after leaving the summit early.
Mr Kudlow accused the Canadian PM of betraying Mr Trump with "polarising" statements on trade policy that risked making the U.S. leader look weak ahead of a historic summit with North Korean leader Kim Jong-un.
Just as the Trudeau-hosted Group of Seven meeting of the world's leading industrialized nations had seemed to weather Trump's threats of a trade war, the president backed out of the group's joint statement that Trudeau said all the leaders had come together to sign. From promoting democracy and to fighting terrorism, "we're on the same page. $800 Billion Trade Deficit ..."
"In a matter of seconds, you can destroy trust with 280 Twitter characters", German Foreign Minister Heiko Maas said when asked about Mr Trump's U-turn, adding it would take much longer to rebuild lost trust.
Trudeau said he had reiterated to Mr. Trump, who left the G7 meeting before it ended, that tariffs would harm industries and workers on both sides of the U.S.
"The response I've given both in private and in public is that any conversations about whether or not Russian Federation could come back around the table cannot take place until Russian Federation has changed its attitude".
Now what Kudlow says is that Canada as a middle power and Justin Trudeau somehow has the ability to knock the feet from under Donald Trump and put the talks with North Korean a different kind of light than how they'd normally be by simply standing up to Canada and saying that these tariffs are unfair. "We strive to reduce tariff barriers, non-tariff barriers and subsidies", it said, reflecting the typical language of decades of G7 statements. May pointed out the importance of maintaining a dialogue with the United States and President Trump.
TAPPER: Oh, I see.
Another stumbling block was the part regarding climate change, where the United States didn't want to see any reference to the Paris Agreement, from which the Trump administration has withdrawn, The Star reported.
Following the remarks by Kudlow and Navarro, Foreign Affairs Minister Chrystia Freeland is far less confrontational in an effort, perhaps, to dial things down - "In terms of the approach that governments choose to take, Canada does not believe that ad-hominem attacks are a particularly appropriate or useful way to conduct our relations with other countries".
"There are always irritants in relationships", Pompeo said, adding that without partners like Canada, "we wouldn't be in this place, we wouldn't have this diplomatic opportunity" with the North.
Trudeau's office said the prime minister had been consistent and level with Trump during the summit.
And Americans are practically apologizing on behalf of their president.
The G7 groups the United States, Japan, Germany, France, Britain, Italy and Canada.