President Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE appointed White House doctor Rear Adm. Ronny Jackson to serve as assistant to the president and chief medical adviser, the White House announced Saturday.

The appointment comes amid a federal inquiry into Jackson’s alleged misconduct as the head of the White House Medical Unit.

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The Defense Department's Office of Inspector General is probing allegations that surfaced after Trump nominated Jackson to become Veterans Affairs secretary last year.

Jackson faces a slew of accusations, including drinking on the job, overprescribing medications and creating a hostile work environment. The allegations derailed Jackson's nomination to be Veterans Affairs secretary, prompting him to withdraw his nomination late last April.

Jackson has denied any wrongdoing.

The president also reportedly re-nominated Jackson earlier this month to be promoted to a two-star admiral. It is unclear if the Senate Armed Services Committee will consider the nomination while the Pentagon investigation is ongoing.

Though Jackson no longer serves as Trump’s personal physician, he remains a Navy physician assigned to the White House.

Trump defended Jackson last year during his nomination process, calling him “one of the finest men I’ve ever met.”