"I'm not sure what activity he's asking me to undertake with either", May said amid laughter.
Heyman waged a campaign on Twitter to persuade Navarro to apologize by saying he was contacting US politicians about his remarks.
PM Justin Trudeau of Canada acted so meek and mild during our @G7 meetings only to give a news conference after I left saying that, "US Tariffs were kind of insulting" and he "will not be pushed around".
Trump, who had criticised Trudeau after the G7 meeting in Canada on the weekend, said the United States had a big trade deficit with Canada, and "a little balance" was needed.
The president's chief economic advisor told Jake Tapper on Sunday that Trudeau "stabbed us in the back" with his post-G7 remarks, calling it a "sophomoric play".
"We were very close to making a deal with Canada on NAFTA ... then we leave and he pulls this sophomoric political stunt for domestic consumption", Kudlow said of Trudeau.
U.S. President Donald Trump's sharp comments against Canada over trade are just a blip in an otherwise unbreakable, long-standing friendship, say some Americans living in the northeastern part of the country near the Canadian border. "Other than he had a news conference that he had because he assumed I was in an airplane and I wasn't watching".
Angela Merkel speaks with Donald Trump at the G7 meeting
"Let me correct a mistake I made", Navarro said at a Wall Street Journal conference Tuesday, according to video provided by the newspaper's CFO Network. The president tweeted from Air Force One that Trudeau was "dishonest", and weak. Trudeau's comments centered around Trump's lack of understanding when it comes to worldwide trade. Also pictured are Japan Prime Minister Shinzo Abe, France's Emmanuel Macron and UK's Theresa May, among others.
REMINDER: This is Canada we're talking about.
The Trudeau hate began after the Prime Minister held a press conference and told reporters that the new USA tariffs on steel and aluminum are "kind of insulting" and that Canada "will not be pushed around".
In this March 31, 2017 file photo, National Trade Council adviser Peter Navarro appears before President Donald Trump arrives to sign executive orders regarding trade in the Oval Office at the White House in Washington.
In contrast, Trump was mostly smiles with North Korea's Kim Jong Un on Monday, and said talks between them were "top-of-the-line".
Tuesday, Trudeau also offered support for Trump.
"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. Trump and Navarro in ratcheting up tensions with Canada since the tariffs were announced at the end of May.More news: Rafael Nadal ready for 'tough final' against Dominic Thiem on Sunday