While airborne, Trump ordered US officials to refuse to sign the traditional end-of-summit communique and tweeted criticism of what he said were Trudeau's "false statements at his news conference". He refused to sign the communiqué, blaming Mr Trudeau for making "false statements" at an end-of-summit news conference, and called the Canadian leader "dishonest & weak".
Nearly as an afterthought, Trump - now in Singapore for a summit with North Korean leader Kum Jong Un - tweeted: "Great to be in Singapore, excitement in the air!"
Trump called Trudeau "very dishonest and weak" on Twitter on Saturday and then sent Kudlow and trade adviser Peter Navarro to hammer the message home on Sunday morning news shows in an extraordinary assault on a close US ally and neighbor.
Saying Trudeau's statements are "amateurish" and "sophomoric" only "for domestic consumption", Kudlow said it was Trudeau's remarks that had prompted Trump to pull out of the joint communique.
Trudeau's office said he had not said anything in his closing G7 news conference he had not said to Trump before. "Canada, thank you for the ideal organisation of G7!", he said further, about the meet hosted by Trudeau in Quebec.
As G7 leaders were scrambling to respond to the latest US U-turn, Emmanuel Macron's office said in a statement: "International co-operation can not be dictated by fits of anger and throwaway remarks". "The non-factual part of this is - they have enormous tariffs", Kudlow said.
Tropical Storm Bud grows off Mexico's Pacific coast
It's too soon to determine whether this second system will eventually pose a direct threat to parts of Baja California next week. In 2017, the basin saw 18 named storms, 9 of which become hurricanes, with 4 classified as major storms (category 3 or higher).
Despite the photo's lionization of Ms. Merkel, it was Mr. Trudeau who would soon feel Mr. Trump's erratic wrath. She also said the U.S. president wasn't entirely wrong in pressing Germany to increase defence spending.
"Fair Trade is now to be called Fool Trade if it is not Reciprocal", Trump tweeted, as he criticized Canadian tariffs on imports of USA milk.
President Trump left the meeting half-way, warning the G7 nations that if they don't remove trade barriers with the US, they will face consequences. He had other things, bigger things, on his plate in Singapore. Trudeau stuck our president in the back. "That will not stand", he noted.
G7 allies seemed as perplexed as Canada at the sudden diplomatic row, and Germany and France accused Mr Trump of destroying trust and acting inconsistently.
The German foreign minister, Heiko Maas, on Sunday called on European nations to stick together following Trump's announcement. The negotiators included agree-to-disagree language on climate change and on an global commitment to reduce plastics in the world.
US President Donald Trump issued a volley of tweets on Monday venting anger on some of Washington's closest North Atlantic Treaty Organisation allies over the United State's trade deficit, following a divisive G7 meeting in Canada.
Former Obama Adviser Suggests Trump Is Russia's 'Chief Advocate' and Defender
President Vladimir Putin flew into Beijing where he was welcomed by Chinese Premier Xi Jingping. China also expects to enhance its anti-terrorism cooperation with Pakistan, Xi said .
The leaders of Canada and the United States are locked in an ugly, escalating public dispute over trade barriers, tariffs and how they think they world should resolve its problems.
On 1 June, the United States imposed a 25% tariff for steel and 10% for aluminium on imports from the European Union (EU), Canada, and Mexico. "That Canada could be considered a national security threat to the United States is inconceivable".
"Instead, we act then too". "We strive to reduce tariff barriers, non-tariff barriers and subsidies", it said, reflecting the typical language of decades of G7 statements.
Trump was reacting to Canadian Prime Minister Justin Trudeau, who said Saturday that Canada would retaliate for Trump's proposed new tariffs.
G7 includes the seven leading industrialized countries of Britain, the United States, France, Germany, Italy, Japan and Canada.
The infamous Donald Trump and Kim Jong-un impersonators return
The self-proclaimed master dealmaker is facing doubts from multiple corners as he prepares to negotiate with Kim Jong Un . The level of concern is higher, though, in Japan, another US treaty ally in Asia with much at stake.