"One can destroy an incredible amount of trust very quickly with one tweet. That makes it even more important for Europe to stand together and defend its interests even more decisively," Mass wrote on Twitter.
On Saturday, the leaders of the Group of Seven (G7) countries – Canada, France, Germany, Italy, Japan, the United Kingdom, and the United States – concluded the two-day summit in the Canadian province of Quebec. Canadian Prime Minister Justin Trudeau said that the final communique had been agreed by all the seven countries.
In the run-up to the G7 summit, US relations with the most of the other G7 countries have deteriorated, since Washington removed an exemption on 25 percent tariffs for steel and 10 percent for aluminum from the European Union, Canada, and Mexico on June 1, which prompted the European Union and Canada to roll out retaliatory measures.