Mr Trump is expected to leave the summit early and travel to Singapore ahead of a meeting there with the North Korean leader Kim Jong-un on Tuesday.
Trudeau's office released a statement in response, that said "we are focused on everything we accomplished here at the G7 summit". He also reiterated his call for Russian Federation, which was ejected from the G8 after its invasion and annexation of Crimea, to be readmitted to the exclusive club of industrialized powers, saying his predecessor President Barack Obama was responsible for Crimea being lost.
He said: "Russia should be in this meeting".
"It's going to change", said Trump.
Democrats were heavily in favor of free trade deals, with 67 per cent saying the deals were good and just 19 per cent opposed to them.
The U.S. president is lashing out on several fronts. Our Tariffs are in response to his of 270% on dairy!
"They didn't tell you that, did they?"
Trump quickly responded on Twitter that he was surprised by Trudeau's comments because he found the prime minister "so meek and mild" at the summit.
Soon after the joint statement was announced, the USA president tweeted defiantly about not allowing "other countries to impose massive tariffs and trade barriers on its on farmers, workers and companies".
"Looking forward to straightening out unfair Trade Deals with the G-7 countries".
"And so began a long litany of recriminations, somewhat bitter reports that the United States was treated unfairly, that the trading system was totally unfavorable to the United States, the American economy, American workers, the middle class", the official said.
As The Guardian reports, the Comminique is actually "a joint statement [among all attending leaders] vowing to fight back against protectionism and pledging to follow established trade rules, in spite of clear differences between the U.S. and their counterparts in the worldwide group".
Trudeau addressed the president's Twitter blasts while visiting Quebec's Saguenay region on Thursday.
British Prime Minister Theresa May said the other G7 leaders registered their "deep disappointment at the unjustified decision by the U.S." on its closest allies.
The Prime Minister said nothing he hasn't said before - both in public, and in private conversations with the President.
Despite Trump's recent decision to slap aluminum and steel tariffs on America's allies, the statement at the conclusion of the summit called for the "free, fair, and mutually beneficial trade", fighting protectionism and "the crucial role of a rules-based worldwide trading system".
Trump also bluntly threatened to end trade with countries that refused to lower their tariffs on the U.S.
Trudeau has worked hard to find common ground with the unpredictable president, but the personal bond he has tried to forge has been strained.
Trump said he discussed the idea of eliminating tariffs with his G7 counterparts.
Trump arrived 17 minutes after the planned 8:00am start time and after Trudeau's opening remarks. "As Canadians, we are polite, we're reasonable, but also we will not be pushed around".