Ryan Zinke is part of a long list of Trump cabinet members questioned for their lavish spending of taxpayer money

Secretary of the Treasury Steven Mnuchin came under fire in August 2017 when he took a $26,900 flight to Kentucky on an Air Force jet, a trip that coincided with the August 21 solar eclipse.

Mnuchin and his wife, Louise Linton, viewed the eclipse from the lawn of Fort Knox, just outside the eclipse's path of totality.

The Treasury secretary's activities also raised questions when it was reported that Mnuchin requested to fly on a US military jet for his honeymoon to Europe. The trip could have cost $25,000 per hour, but it was ultimately scrapped after consideration by officials at the Treasury Department.

Earlier this month, Housing and Urban Development Secretary Ben Carson came under fire when his staff reportedly said they were attempting to cancel an order for a $31,000 mahogany dining set to replace the 50-year-old table currently in Carson's office.

Carson's business manager said the secretary intended to cancel the order, but that it might not be possible.

"HUD is a bureaucracy, so everything is complicated. The person they contracted has already spent $14,000 making the table," Armstrong Williams told The New York Times. "While his intentions are to cancel it, we have to see what happens."

The Inspector General released a report in February that implicated Shulkin's chief of staff in "serious derelictions" for doctoring emails to ensure that the government would pay travel expenses for the secretary's wife on a trip to Europe.

Vivieca Wright Simpson, the chief of staff, retired in response to the report, which also accused Shulkin of improperly accepting tickets to the Wimbledon tennis tournament during a government trip.

Shulkin criticized the findings in an addendum to the report, saying, "It does not appear accurate or objective, and it contains a thread of bias."

He did, however, ultimately reimburse the government for his wife's airfare.

Shulkin was appointed to an under secretary position at the Department of Veteran Affairs by former President Barack Obama in 2015.

Last month, the Washington Post reported that Pruitt regularly spends thousands of taxpayer dollars on domestic and international airfare, staying at upscale hotels, for trips that are often not entirely relevant to his work as a cabinet official.

In one example, Pruitt spent more than $1,600 on a first-class plane ticket from Washington to New York in June 2017 in order to make two brief television appearances to promote the president's decision to withdraw from the Paris climate agreement.

Pruitt defended his first-class air travel.

"We live in a very toxic environment politically, particularly around issues of the environment," he told the New Hampshire Union Leader. "We've reached the point where there's not much civility in the marketplace and it's created, you know, it's created some issues and the [security] detail, the level of protection is determined by the level of threat."

Tom Price, the former Health and Human Services secretary, resigned from his post in late September 2017 after sparking bipartisan outrage over his extensive use of chartered flights.

Price's travel cost taxpayers more than $1 million. Politico found 24 instances in which Price opted for a private jet over commercial flights, at a price tag of more than $400,000, while his the cost for his use of military jets exceeded $500,000.