"President Trump is targeting the dairy sector because he wants to dump US dairy into Canada", Lampron told The Canadian Press, adding that Canada imports five times more dairy from the USA than it exports.
Earlier on Saturday, Trudeau said that he would "with absolute certainty" impose retaliatory tariffs on the United States in response to Trump's tariffs on steel and aluminum, which the Trump administration imposed in the name of national security.
The tit-for-tat dispute over USA metals tariffs followed more than a year of tense and so far unsuccessful negotiations to renew NAFTA and a long and failed charm offensive by Trudeau and top Canadian officials to avoid Trump's trade ire.
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.
Despite earlier reports of a rant over trade from Trump, he said the meeting "was not contentious" and called the relationships between the leaders "outstanding".
Trump created a distraction when he walked in late for Saturday's breakfast meeting during the Group of Seven summit of leading industrialized nations being held in Quebec. Mr Trump said the move would protect domestic producers that were vital to United States security.
Pubs remove Saudi flag from World Cup bunting after complaint
But Turkey substitute Yunus Malli equalized in the 60th minute, beating veteran goalkeeper Igor Akinfeev with a 25-meter strike. The 2014 game was the third time that the two teams had faced off in the final of the World Cup (1986 and 1990).
President Trump said he expects something will happen on trade, and that it will be positive.
Russia was ousted from the elite group in 2014 as punishment for Vladimir Putin's annexation of Crimea, and its support for pro-Russian separatists in Ukraine.
President Donald Trump leaves the main building alongside White House Press Secretary Sarah Huckabee Sanders during the G7 Summit on June 9, 2018 in Quebec City, Canada. "Or we're going to make a deal directly with Canada, directly with Mexico", Trump said.
President Donald Trump shook up a meeting of the leaders of the world's richest countries with a proposal to eliminate all barriers to global trade, a surprise turnaround from his aggressive tone on tariffs before the summit.
"He's happy", said Trump, to laughter.
The American leader said a three-country deal would only be possible with substantial changes, and reiterated his interest instead in forming separate two-way trade accords with Mexico and Canada - an interest Canada has made clear it does not share.
Macron said the agreement would be a good first step and represented the G7 nations' desire to stabilize the situation.
President Trump leaves the G-7 summit after holding a press conference in the Canadian resort town of La Malbaie.