The G-7 meeting ended in acrimony with United States President Donald Trump refusing to sign a joint declaration by the group.
Soon after departing for Singapore, Mr Trump sent Twitter messages accusing Canadian Prime Minister Justin Trudeau of making false statements. He was responding to a joint statement issued by Mr Trudeau's government, which said it had been agreed to by all seven countries. Disputing this, Mr Trump ordered US officials "not to endorse the communique".
His chief economic adviser later accused Mr Trudeau of being out to make Mr Trump look weak ahead of his summit with North Korea.
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