“President Trump upended two days of global economic diplomacy late Saturday, refusing to sign a joint statement with America’s allies, threatening to escalate his trade war on the country’s neighbors and deriding Canada’s prime minister as ‘very dishonest and weak,’” the New York Times reports. “In a remarkable pair of acrimony-laced tweets from aboard Air Force One as he flew away from the Group of 7 summit toward a meeting with North Korea’s leader, Mr.