Nikki Haley has worked on trade and labour issues as governor but has little diplomatic experience.
Well-known Indian American Nikki Haley, Governor of South Carolina state, has accepted President-elect Donald Trump's offer to serve as envoy to the UN in the coming administration, the Washington Post has reported.
The planned decision marks Trump's first female appointment to a Cabinet-level post.
An official spoke on the condition of anonymity to the Post as the decision has not yet been announced by Trump's transition team.
Ms Haley, 44, who is a daughter of Indian immigrants and is serving her second term, has worked on trade and labour issues as governor but has little diplomatic experience.
However, her stance on issues related to US military and national security align with the GOP's hawkish mainstream, the daily said.
President-elect Trump met Ms Haley last week at Trump Tower in New York as part of the round of meetings for key administration posts.
Ms Haley is expected to be paired with Mitt Romney, an ally and a leading candidate to become secretary of state. The pair were critical of Trump's several stances during the 2016 campaign, which included a proposed temporary ban on Muslims entering the country.
The GOP administration is likely banking on Ms Haley's strong communication and problem-solving skills, required for the US representative at the United Nations in New York.
If confirmed, Haley would be replaced by South Carolina's Lt Gov. Henry McMaster, who is a top Trump ally.