Trump appointed Ronny Jackson as chief medical adviser, amid ongoing Pentagon investigation

Donald Trump appointed Rear Adm. Ronny Jackson, his former physician, as assistant to the president and chief medical adviser on Saturday, the White House announced.

Trump had nominated Jackson last year to run the Department of Veterans Affairs, though Jackson later withdrew his name for consideration over mounting allegations of misconduct.

Jackson had been accused of being "abusive" towards colleagues, drinking on the job, and loosely prescribing medications. Jackson has denied all allegations of wrongdoing, though a Pentagon investigation remains ongoing.

Read more: Watchdog report: Trump's embattled VA pick ran unit that made employees feel 'caught between parents going through a bitter divorce'

Jackson also garnered skepticism last year after performing Trump's annual physical exam and declaring in glowing terms that Trump was in "excellent health" and had "incredibly good genes."

Jackson has a long history of treating presidents, first joining the White House in 2006 during former President George W. Bush's second term, then continuing under former President Barack Obama.