News Nikki Haley to resign as U.S. envoy to U.N. Nikki Haley will resign her post as U.S. envoy to the U.N. at the end of 2018, U.S. President Donald Trump announced without explaining why. By Arete News - October 9, 2018 U.S. Ambassador to the U.N. Nikki Haley at a U.S. Department of Defense news conference (AN/DoD/EJ Hersom) You need to login to view this content. Please Login. Not a Member? Join Us