"So he holds a press conference - the president is barely out of there on the plane to North Korea, and he starts insulting us, he starts talking about the U.S.is insulting Canada", Kudlow said. French President Emmanuel Macron said France and Europe were standing by the G-7 statement, adding "whoever reneges on them is showing incoherence and inconsistency".
And he warned that it would take much longer to rebuild the lost trust. "But not enough yet", said Heyman, now an adviser with the think-tank Canada 2020.
The former Conservative prime minister said that while he believes the dispute is serious, that doesn't make it "lethal". Mr Trump said the move would protect domestic producers that were vital to USA security.
The United States and Canada "fighting over our trade relationship when the Chinese have a 4-to-1 imbalance with both of us is in my judgment just the wrong priority", Harper told Fox News.
On Sunday, White House economic adviser Peter Navarro, who said there was "a special place in hell" for Trudeau, criticized the government's outreach campaign, saying the Canadians should "spend more time at the bargaining table and less time lobbying Capitol Hill and our press and state governments".
Canada's limited options mean "there is no magical Plan B", said University of Ottawa global affairs professor Patrick Leblond.More news: Kim Jong Un goes for surprise nighttime walk ahead of summit
The prime minister has kept a low profile since Trump called him "very dishonest and weak" and withdrew support for a Group of Seven communique reached at the summit Trudeau hosted in Quebec on Saturday.
"This has to be a political play".
While other presidents and prime ministers have had testy relations - president Richard Nixon famously used a profane word, behind closed doors, to refer to Trudeau's father Pierre Trudeau, also in the context of trade talks - neither side has demonstrated this level of animosity since John Diefenbaker feuded with John F. Kennedy in the early 1960s.
Trump's needless attack on Trudeau was not a show of strength, as Kudlow and the bootlickers insist.
We have come together to lay out where we agree, to highlight the need to continue to work together to serve the citizens who elected us.
Before leaving for Singapore, Mr. Trump had delivered a stark warning to America's trading partners not to counter his decision to impose tariffs on steel and aluminum imports.More news: Trump says Larry Kudlow suffers a heart attack
After the conclusion of the summit, Trump again said he would not allow other countries to impose barriers on the United States.
"The world as we know it, namely the USA -led rules-based multilateralism, is now in serious danger of unraveling, as illustrated at the G7 meeting", said Erik Nielsen, chief economist at Unicredit Bank.
"Canada does not conduct its diplomacy through ad hominem attacks, we don't think that it's a useful or productive way to do business and perhaps we refrain particularly from ad hominem attacks when it comes to our relationship with our allies", she declared.
One new reason for optimism in Ottawa is a new-found strength in numbers. The countries coordinated closely on their response, Freeland said.
The second issue was United States' insistence on "reciprocal" trade, the source said.
Domestically, Trudeau has also received support from all corners, and is backed by all opposition parties.More news: Wendy's had a savage response to the IHOb name change
Mel Cappe, Canada's former ambassador to Britain and onetime head of the federal public service, called on Trudeau to seek a formal apology from Trump for what he called an "unprecedented" attack on a democratic leader.
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