Senator Susan Collins came to Canada's defense amid a renewed attack by Donald Trump on Sunday night, citing her state's close relationship with the country.
Trump had already said he would not hesitate to shut countries out of the USA market if they retaliate to steep tariffs he has imposed on steel and aluminium imports.
A boxing enthusiast who dons his gloves to work off the stress of the job in his rare free time, the Canadian prime minister will have to carefully measure his punches against the U.S. leader, who publicly accused him of weakness and dishonesty after the meeting of the G7 nations in Quebec at the weekend.
"I can't believe this has to be said, but Justin Trudeau obviously didn't have a "fake eyebrow" falling off during his press conference with Emmanuel Macron", the reporter tweeted.
"The U.S. pays close to the entire cost of North Atlantic Treaty Organisation - protecting many of these same countries that rip us off on trade (they pay only a fraction of the cost - and laugh!)", he tweeted.
Tensions have been building between the two countries for months, as President Trump has targeted Canada as one of the many countries he sees as giving American the short end of the stick in trade deals.
The North American Free Trade Agreement (NAFTA) is a deal signed by Canada, Mexico, and the United States, creating a trilateral trade bloc in North America. In the most Canadian manner (polite), not directly targeting anyone unlike POTUS (President of the United States).
Canadian Foreign Minister Chrystia Freeland had responded to the White House comments by saying that Canada will retaliate to USA tariffs in a measured and reciprocal way and that Canada will always be willing to talk.
The president seems to think raising US tariffs will accomplish that end. Canada does indeed impose a 270% tariff on dairy that has kept many USA dairy products from making their way from the U.S.to Canada.
It appears as though Trump is the one performing a stunt, raging at Trudeau in theatrical fashion without a clear reason to be so worked up. "I'm arguing Trudeau picked the fight", he said.
Trump's top economic adviser, Larry Kudlow, suggested Trump saw Trudeau as trying to weaken his hand before the summit with North Korea's Kim Jong Un, saying the president won't "let a Canadian prime minister push him around".
On Sunday, Mrs Merkel labelled Mr Trump's use of Twitter to withdraw from the G7 communique on trade "sobering and a bit depressing".
Lawmakers gave unanimous consent for a motion backing Canadian steel and aluminium, hit by US tariffs, as well as the supply management system that supports key agriculture sectors, and gave a standing ovation for the government's response to the Trump administration's verbal attacks on Trudeau.
"I'm unconcerned about our capacity to continue to do what we need to do".
Pompeo declined to comment on the specific remarks by Navarro. I mean, it's not a question of 'I hope it changes.' It's going to change, a hundred percent.
"Fair Trade is now to be called Fool Trade if it is not Reciprocal".
The president concluded his tweetstorm by saying, "Sorry, we can not let our friends, or enemies, take advantage of us on Trade anymore".
White House economic adviser Larry Kudlow and trade adviser Peter Navarro drove the message home in an extraordinary assault on a close United States ally and neighbour.