NEW YORK, Nov. 23 -- US President-elect Joe Biden plans to nominate longtime foreign policy adviser Antony Blinken to serve as his Secretary of State, while picking another confidante, Jake Sullivan, for the role of National Security Adviser, according to news media reports.

Linda Thomas-Greenfield, a veteran diplomat, will be nominated as Ambassador to the United Nations, giving the former career Foreign Service officer and African-American woman one of the most high-profile posts in government, reports in The New York Times and Washington Post said. With a cabinet rank, she will have a seat on the National Security Council.

During her 35-year career as a diplomat, Ms. Thomas-Greenfield also served in the American Embassy in Islamabad....