President Donald Trump poses with NATO leaders for a group photo at the new NATO headquarters, Brussels, May 25, 2017 (AP photo by Evan Vucci).

U.S. President Donald Trump’s battle with the multilateral system just got real. For the first four months of his presidency, Trump fought a phony war with the United Nations and other international institutions. On the campaign trail and in the wake of his election victory, he had condemned the U.N. as lazy, impotent and anti-American. From its first week in office, his administration threatened major financial cuts to international institutions and aid projects. But there was more bark than bite. Nikki Haley, the U.S. ambassador to the U.N., calmed foreign diplomats’ fears by taking a rational and collegial approach to […]