washington u.s. president barack obama friday say confident unite nations secretary general-elect antonio guterres would effective leader international organization extraordinary reputation obama tell reporters ahead meet white house guterres former prime minister portugal note guterres lead multilateral delegations high level obama say great confidence guterres would able ensure u.n. would able operate efficiently effectively take issue climate change international refugee crisis time challenge mount effective partner unite nations secretary general critically important obama say guterres take head world body five years jan. 2017. portugal prime minister 1995 2002 u.n. high commissioner refugees 2005 2015. obama guterres expect discuss cooperation unite state unite nations guterres say ready forge relationship u.s. president-elect donald trump administration say totally commit work closely unite state present administration also next administration trump take office jan. 20 name south carolina governor nikki haley relatively little foreign policy experience next u.s. ambassador unite nations real estate magnate unconventional campaign prompt uncertainty administration handle international relations campaign promise build wall along u.s.-mexican border suggest nato partner need pay security raise concern among ally trump slat meet john bolton serve u.s. ambassador u.n. president george w. bush friday bolton run cabinet position call major reform u.n. obama express confidence incoming u.n. chief guterres