President Donald Trump has announced that he plans to nominate Kelly Knight Craft for the country's vacant post of United Nations envoy. Ms Knight Craft is currently the US ambassador to Canada. She will replace Nikki Haley, who resigned last year. In two tweets announcing her nomination, the president congratulated her and said she had done an "outstanding job" in her current role. Mr Trump's first pick, Heather Nauert, withdrew her candidacy last week. The former Fox News presenter said she made the decision for family reasons after a "gruelling" two months in the spotlight. Nikki Haley congratulated Ms Knight Craft shortly after the president's online announcement. "She's done a great job representing us as @USAmbCanada and we know she'll be a strong voice for America at the United Nations. #USstrong," the former ambassador said in a Tweet. Secretary of State Mike Pompeo has also issued a statement praising the nomination, saying he was "very pleased" with the choice and said he looked forward to working with her at the UN. US media reports say the role will probably be downgraded from the Cabinet-level position it was during Ms Haley's tenure. Ms Knight Craft has to be formally nominated and approved by the US Senate before she can assume the role. AFP.