Trump slams 'uncontrolled migration' — and blames the U.N.toggle caption Michael M. Santiago/Getty ImagesPresident Trump warned world leaders at the United Nations General Assembly of "uncontrolled migration" and accused the U.N. of contributing to the problem. It has such tremendous, tremendous potential, but it's not even coming close to living up to that potential," Trump said. He pointed fingers at the United Nations — of which he's long been a critic — directly on the topic. "The United Nations is funding an assault on Western countries and their borders," he said. Despite his criticism, Trump met with the secretary general after his speech and vowed, "Our country is behind the United Nations 100%."