Navarro had told Fox News on Sunday that there was a "special place in hell" for the Canadian prime minister that "engages in bad-faith diplomacy" with U.S. President Donald Trump. And what did Trudeau do as soon as the plane took off from Canadian airspace?
The trade adviser's remarks also drew criticism from some USA lawmakers and foreign allies.
USA economic adviser Larry Kudlow said Trudeau "kind of stabbed us in the back" with his comments.
"And I see the television and he's giving a news conference about how he will not be pushed around by the United States and I say push him around?".
The other countries at the G-7 summit, however, rallied to Mr. Trudeau's support. "Kim must not see American weakness". Eventually, a compromise was reached for the text, which reads: "We underline the crucial role of a rules-based global trading system". "Are those the ...words of the president towards Trudeau?"
As the Trump administration's war of words continued, many Americans began to point out on social media the many times Canada has helped the United States, while sharing personal stories on why they are thankful for their neighbours to the north, prompting the hashtag #ThanksCanada to trend on social media Monday morning. Can't do it in person.
The Trump administration took umbrage at an ally publicly criticizing USA policy just before a historic meeting with Kim Jong-Un.
"On his comments, I'm going to stay focused on defending jobs for Canadians and supporting Canadian interests", Trudeau said before walking away from reporters.
"I want to pay a particular tribute to Prime Minister Trudeau for his leadership and skilful chairing, which enabled us after two days of negotiation between leaders to agree actions and a shared approach on some of the most pressing challenges facing the worldwide community and our citizens", she told parliament.
Trump on Saturday skipped out early on the G-7 meeting after rejecting the summit's statement of shared values. From promoting democracy and to fighting terrorism, "we're on the same page". "I'm unconcerned about our capacity to continue to do what we need to do".
Lucey reported from Singapore and Gillies from Quebec City.