A top aide to Treasury Secretary Steven Mnuchin Steven Terner MnuchinLawmakers fear voter backlash over failure to reach COVID-19 relief deal United Airlines, unions call for six-month extension of government aid House Democrats plan to unveil bill next week to avert shutdown MORE flew on a hedge fund billionaire's private jet earlier this year, The Washington Post reported Tuesday, the latest instance of a Trump administration official using private travel with potential work implications.

Eli Miller, Mnuchin’s chief of staff, flew to Palm Beach, Fla., several months ago with Nelson Peltz, a founding partner of investment group Trian Fund Management, on Peltz’s private jet, according to the Post. The exact date of the trip is unclear.

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Palm Beach is home to President Trump’s Mar-a-Lago golf club, where Trump often spends weekends and huddles with top advisers. The Post noted that Peltz also has an estate in Palm Beach reportedly worth at least $100 million.

The Treasury Department confirmed Miller’s flight with Peltz to the newspaper, saying the senior aide and the New York hedge fund manager are longtime friends.

“The Treasury ethics office advised Mr. Miller that he was permitted to accept a seat on a plane from a friend with whom he has a preexisting relationship under federal ethics law,” a Treasury spokesman told the Post.

As Mnuchin’s chief of staff, Miller is close to the Treasury Department’s efforts to design the Republican tax-cut plan and loosen Obama-era banking regulations. Both issues have a major impact on the U.S. financial markets, including Peltz’s firm.

Miller is the latest Trump administration official to come under scrutiny for their travel while in office, which has included Mnuchin himself.

The Treasury’s inspector general is investigating Mnuchin’s flight to Fort Knox, Ky., during the solar eclipse in August.

Health and Human Services Secretary Tom Price Thomas (Tom) Edmunds PriceConspicuous by their absence from the Republican Convention Coronavirus Report: The Hill's Steve Clemons interviews Chris Christie Trump flails as audience dwindles and ratings plummet MORE resigned last Friday after Politico revealed that his travel on military and private planes had cost taxpayers at least $1 million since May.

The Interior Department’s inspector general is also investigating Secretary Ryan Zinke Ryan Keith ZinkeTrump extends Florida offshore drilling pause, expands it to Georgia, South Carolina Conspicuous by their absence from the Republican Convention Trump flails as audience dwindles and ratings plummet MORE’s flight on a private jet owned by oil lobbyists.