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 on Friday nominated the head of U.S. Pacific Command, Adm. Harry Harris Jr., as his ambassador to South Korea.

The White House touted Harris's years of experience in the Navy and knowledge of the Indo-Pacific region in announcing his nomination.

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Harris has served in the military for four decades, with seven command assignments including for the U.S. Pacific Fleet, the U.S. 6th Fleet and VP-46.

Secretary of State Mike Pompeo Michael (Mike) Richard PompeoOvernight Defense: Pentagon redirects pandemic funding to defense contractors | US planning for full Afghanistan withdrawal by May | Anti-Trump GOP group puts ads in military papers Overnight Defense: House Democrats unveil stopgap spending measure to GOP opposition | Bill includes .6B for new subs | Trump issues Iran sanctions after world shrugs at US action at UN Navalny calls on Russia to return clothes he was wearing when he fell ill MORE was rumored last month to be mulling switching Harris, who was initially nominated as Trump's pick to Australia, to instead be his envoy to Seoul.

His nomination comes as the Trump administration continues to prepare for a possible summit between Trump and North Korea's Kim Jong Un next month in Singapore as part of efforts to denuclearize the Korean Peninsula.

If confirmed by the Senate, Harris would fill a vacancy that has unsettled some members of Congress and State Department officials.

The position has been open since Trump took office in January 2017 and its responsibilities have been handled for nearly 16 months by Chargé d'Affaires Marc Knapper. The ambassador role has also become increasingly important since Joseph Yun, the special representative for North Korea policy, retired in March.

Pompeo has vowed to fill a number of lingering vacancies in the State Department. During his confirmation hearing last month, the former CIA director promised lawmakers to work quickly to fill key posts. Earlier this week, he lifted a hiring freeze on the Foreign and Civil services that had been imposed last year by his predecessor, Rex Tillerson Rex Wayne TillersonGary Cohn: 'I haven't made up my mind' on vote for president in November Kushner says 'Alice in Wonderland' describes Trump presidency: Woodward book Conspicuous by their absence from the Republican Convention MORE.

Harris's nomination came days after North Korea abruptly scrapped a planned meeting with South Korea over its joint military exercises with the U.S. Pyongyang also threatened to back out of the June 12 summit with Trump if the U.S. insisted on "unilateral nuclear abandonment."

Max Greenwood contributed to this report, which was updated at 7:21 p.m.