Trump said he chose to back out of the G7 communique after watching Trudeau's closing summit news conference, at which he warned that Canada would not be pushed around on tariffs - a point the Canadian prime minister had made several times before.
Navarro said Trump "did the courtesy to Justin Trudeau to travel up to Quebec for that summit".
In a string of angry tweets, Trump said the USA paid "close to the entire cost of Nato" to help protect countries that "rip us off on trade".
The president recently announced a 25 percent tariff on steel and a 10 percent tariff on imported aluminum from nations including the Canada, Mexico and the European Union. She also said the European Union would "act" against the US trade measures.
Trump once again went after Trudeau for what Trump considers unfair trading practices. Trump repeated his criticism of Canadian Prime Minister Justin Trudeau during the news conference.
Trump says he watched that news conference on his way to Singapore, and was upset because he thought he and Trudeau had had a positive meeting in Charlevoix.
The leaders of the G7, the world's most powerful industrialized countries including Canada, France, Germany, Italy, Britain, Japan and the U.S., meet every year to discuss collaboration on issues like world economy, climate change, security and peace.
"I don't blame them, I blame our leaders", he said. Mr. Trump said the move would protect domestic producers that were vital to U.S. security.
Macron and Trudeau had criticized Trump's tariffs on imports of aluminum and steel into the country, with Macron suggesting that the US could be excluded from a joint statement. Not long after Trump issued two tweets calling Trudeau "very dishonest & weak". "I had a very good meeting with the G-7".
White House trade adviser weighs in on 'Fox News Sunday'. The US president and Mr Trudeau have had a friendly relationship in the past, but tensions over US tariffs have strained the diplomatic partnership.
Former Conservative cabinet minister James Moore, a member of the government's advisory group on NAFTA, hailed Trudeau's approach, refusing to react to "the noise, the bluster, the Twitter, the emotional outbursts".
Trump did not seem to think that this question was unreasonable.
Bilous said there are still strong trade opportunities with the United States. "The Prime Minister said nothing he hasn't said before - both in public, and in private conversations with the President", the office added.