A war of words has erupted between the United States and its G7 allies, hours after the group had put on an apparent show of unity at the end of a tense summit.
US President Donald Trump has continued his personal attacks against Canadian Prime Minister Justin Trudeau, tweeting that he "acts hurt when called out".
Germany's Angela Merkel said Mr. Trump's decision to reject a joint communique was "sobering" and "depressing".
That statement had sought to overcome deep disagreements, notably over trade.
In recent weeks, trading partners of the US have criticised new tariffs on steel and aluminium imports imposed by the Trump administration.
In a news conference after the summit, the Canadian leader reasserted his opposition to the US tariffs, and vowed to press ahead with retaliatory moves on July 1.