Lindsey Graham on Tuesday suggested that if North Korean leader Kim Jong Un attempts to renege on a deal with Donald Trump, he could end up on the USA president's bad side - just like the leader of one of the US's closest allies, Canadian Prime Minister Justin Trudeau. "The problem was that in conveying that message I used language that was inappropriate".
"We finished the meeting, really everybody was happy, and I agreed to sign something", Trump said.
The following day, Trump's trade czar Peter Navarro made scathing comments about Trudeau during an appearance on Fox News. Trudeau had criticized Trump for the new tariffs and vowed that Canadians "will not be pushed around".
"I see (on) the television that he's giving a news conference about how he will not be pushed around by the United States". He called on Trudeau to apologise to Trump.
The summit ended in disarray: US President Donald Trump said the US would not endorse the joint statement from the summit.
The United States has alienated Canada and other allies by imposing tariffs on steel and aluminum imports, arguing that they pose a threat to US national security.
On Sunday, Navarro, who is Trump's most hawkish trade adviser, assailed Trudeau for engaging in "bad faith diplomacy" in the wake of the G-7 meeting.
Trump says Trudeau "probably didn't know that Air Force One has about 20 televisions". And I say, push him around? "But actually we were just talking, the whole group, about something unrelated to everything, very friendly".
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"He'll learn that's going to cost a lot of money for the people of Canada. "(Trudeau) learned. You can't do that.
Freeland said she had a "good conversation" Sunday with US Trade Representative Robert Lighthizer, and that the pair would try to meet in Washington this week.
Before the apology, some USA lawmakers on Tuesday questioned the strong language the White House and Trump have used toward Canada in contrast to the praise he gave North Korea at Tuesday's summit in Singapore.
The president said he had a "good relationship with Justin". There was no immediate response to the apology from Trudeau. He also met privately with dairy farmers in his office.
After Trudeau's news conference, Trump pulled the USA out of the G-7's official statement of common values and accused the prime minister, who hosted the G-7 conference, of making "false statements" while also blasting him as "very dishonest and weak".
Canada, she said, is still seeking a "win-win-win" NAFTA deal, while adding that Ottawa will remain "absolutely resolute in defense of the national interest".
"From the beginning we have said that our approach would be to hope for the best, to work for the best possible outcome but always be prepared for the worst, to have a Plan B, C, D, E and F - and maybe to the end of the alphabet". They take effect July 1.
"I think we've simply got to continue and expand that effort that's been developed", Former Canadian Foreign Minister Lloyd Axworthy told the Canadian Broadcasting Corp. on Tuesday.