The use of government air travel by Treasury Secretary Steven Mnuchin is once again under scrutiny.

Mnuchin, a former Goldman Sachs banker and film producer, asked for the use of an Air Force jet to travel to Europe for his honeymoon in Scotland, Italy, and France, according to ABC News.

The use of the jet was denied, according to the report, but it would have cost about $25,000 an hour to operate the aircraft for the trip.

This is the second time in two months that Mnuchin’s travel has come under scrutiny. In August he traveled with his wife, Louise Linton, to Fort Knox in Kentucky for the solar eclipse. The Treasury said the travel was not improper because Mnuchin was in Kentucky for meetings to discuss taxes and the travel of Linton would be reimbursed.

Mnuchin’s net worth from his pre-White House investment days is roughly $300 million.

The Fort Knox trip prompted an internal review of the matter by the Treasury inspector general, according to ABC News, and the same office is now looking into Mnuchin’s honeymoon request.

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The use of such a jet would be highly unusual for a Treasury secretary, as military aircraft are typically reserved for cabinet members who deal directly with national security.

A Treasury official told ABC News that Mnuchin requested the Air Force jet to ensure he had a secure method of communication and that the request was denied because it was deemed “unnecessary” because there were other ways to securely communicate.