The White House formally nominated Pacific Command chief Adm. Harry Harris on Friday to fill the long-vacant post of ambassador to South Korea, as the U.S. gears up for the planned first-ever talks between a sitting American president and a North Korean leader on June 12 in Singapore.

The White House praised Harris in a statement as "a highly decorated, combat proven Naval officer with extensive knowledge, leadership, and geopolitical expertise in the Indo-Pacific region."

If confirmed by the U.S. Senate, Harris would fill a key diplomatic posting that has been vacant since Trump took office in January last year.