The White House formally nominated Adm. Harry Harris Jr. on Wednesday to be Washington's top envoy to South Korea.

The Trump administration announced its intent to nominate Harris, the head of U.S. Pacific Command, as its ambassador to Seoul last week.

He had previously been tapped as its envoy to Australia. Trump formally withdrew that nomination on Wednesday.

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Harris has served in the military for four decades, and has extensive experience in the Pacific.

His nomination for the ambassadorship in Seoul comes as the U.S. preps for a summit between President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE and North Korean leader Kim Jong Un, which is set to take place on June 12 in Singapore.

While his nomination was sent to the Senate on Wednesday, it's not clear when Harris could get a hearing, though it could take some time, a congressional aide told The Hill.

The aide said that congressional leaders would have to hold a new round of meetings on the nomination.

"Different posts require different questions and vetting," the aide said.

Rumors initially swirled since last month that Harris could be chosen to serve as the ambassador to South Korea – a position that has been handled for 16 months by Chargé d'Affaires Marc Knapper.