US President Donald Trump - now in Singapore where he will hold a historic meeting with North Korean leader Kim Jong-un - also had a go at European countries with regard to their financial obligations within NATO.
The tweetstorm is the latest fallout from a bad-tempered G7 summit in Quebec, Canada, in which the President found himself at odds with numerous leaders present, largely over his planned tariffs on a range of goods, including steel and aluminum.
"Kim must not see American weakness", Kudlow said.
When Shaun Kelly saw the tweets he started thinking about how the conversation could be expanded into the physical world, which is why he called on his fellow Americans to plant a tiny flag on their lawn in support of Canada.
On Wednesday, it was officially confirmed that the United Bid, which includes Canada, Mexico, and the USA, would be hosting the FIFA World Cup 2026.
The feud escalated on Friday and Saturday as Trump called for Russian Federation to be readmitted to the G-7, a group of leading industrialized nations, and declared after he left the summit that the USA would not endorse a joint communique issued by the group. I have a good relationship with Justin Trudeau. "It's very unfair, and it's very unfair to our workers, and I'm gonna straighten it out". President Trump had announced new tariffs on steel and aluminum, explaining that Canada and European nations had taken advantage of the trade process.
Smith also recounted the incident when Trump denied German chancellor Angela Merkel a handshake during a meeting in the Oval Office. We just shook hands.
Kim Jong-un Invites Trump to Pyongyang for Second Round of Summit
It formally referred to Trump by his full name in the Monday report, including his middle initial - the first time it has done so. He thanked Singapore's organisation of the summit as if it was "their own family affair".
Mr Trump's comments after a summit in Singapore with North Korean leader Kim Jong Un were his most extensive on the matter since he tweeted that Mr Trudeau was "very dishonest and weak" and raised the prospect of tariffs against auto imports, a move that would imperil the Canadian economy.
"PM Justin Trudeau of Canada acted so meek and mild during our @G7 meetings only to give a news conference after I left saying that, "US Tariffs were kind of insulting" and he 'will not be pushed around, '" Trump fumed on Twitter.
Trump's post G7 tweets also revisited an old bugbear - the funding of the North Atlantic Treaty Organisation military alliance.
"He learned", Trump said.
"Stay calm, keep moving forward, be the adult and come back with meaningful and substantive policies at the table that makes sense to arrive at an appropriate NAFTA outcome".
Sen. Bob Corker, the Tennessee Republican who chairs the Foreign Relations Committee, said that "you'd have to be not paying attention to know that we've damaged relations" with Canada.
She was the first Canadian politician to set foot in the American capital after Trump and two of his top economic advisers launched unprecedented personal attacks on Prime Minister Justin Trudeau for criticizing the tariffs at the weekend G7 summit in Quebec.