Before leaving, President Trump joined the other leaders in issuing a statement saying Iran "can never have a nuclear weapon" and calling for a "de-escalation of hostilities in the Middle East.

U.S. President Donald Trump sounded an optimistic tone as he met with Prime Minister Mark Carney Monday on the sidelines of the G7 summit in Kananaskis, Alta., to discuss tariffs and other trade irritants — saying he thinks the two leaders can hammer out a deal within weeks or sooner.