Peter Navarro lit into Canadian Prime Minister, accusing him of acting in 'bad faith'. He really, actually, you know: "he did a great disservice to the whole G-7", he said. His tweet also accused the prime minister of being "dishonest and weak", and claimed that he only placed tariffs on aluminum and steel in response to Canada's "270% on dairy!"
"We're like the piggy bank that everybody is robbing, and that ends", said Trump.
Trump, who has exchanged barbs with Macron via Twitter in the lead-up to the summit in Canada, also had warm words for the French president.
"I have made it clear to [President Trump] that it is not something we relish doing, but it is something that we absolutely will do", Trudeau said.
Trump did Trudeau a "courtesy" by attending the G7 in Quebec, even when he had "bigger things on his plate in Singapore, Navarro said Sunday".
Mr Trump had already left the summit when Mr Trudeau announced retaliatory measures Canada would take next month in response to United States tariffs on steel and aluminium imports from Canada, Mexico and the European Union.
Trudeau told the president that Canadians did not take it lightly that the US has moved forward with significant tariffs on their steel and aluminum industry.
Kudlow said Kim must not see "American weakness" on the eve of the Tuesday summit.
Within minutes of the official release of the document, Trump attacked Trudeau on Twitter over what he described as the prime minister's "false statements" during the closing G7 news conference - and the president announced the USA would no longer endorse the communique.
"We have a very good relationship with President Trump, we work with President Trump, the United Kingdom has a very good relationship with the USA", she said.
The photograph proved popular on social media, with many commenting on how symbolic the photo is, given Trump's relations with some of the leaders in the room following his new tariffs.
He called Trudeau's post-summit press conference, in which he said Canada will not be "pushed around" by the USA after Trump had already left the meeting, a "sophomoric, political stunt for domestic consumption".
The two-day summit in Canada has been marred by a tit-for-tat exchanges of hostile tweets, with US trading partners furious over Trump's decision to impose tariffs on steel and aluminum imports from Canada, the European Union and Mexico as part of his "America First" agenda. "And we don't want there to be one", Macron said. Other images of the same gathering suggested a more relaxed interaction, Merkel smiling and Trump making eye contact while Trudeau, also smiling, stood by.
Trudeau called the fact that the USA had based the tariffs on a national security reason "kind of insulting".
Officials from European delegations quickly leaked copies of the joint statement, and it was published online moments before Mr Trump tweeted.
"I would say the relationship is a 10, and I don't blame them".
European officials said Mr Trump had tried to water down the language in the draft communique on the WTO and rules-based trade. The US isn't expected to join separate agreements for cleaner oceans or combating climate change, which the other six nations will sign, Merkel said.