The White House issued a memo to members of President Trump's Cabinet on Friday outlining rules for travel after the president's health 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 following backlash over his use of private jets for official business.

"Government-owned, rented, leased, or chartered aircraft should not be used for travel by Government employees, except with specific justification - per the Office of Management and Budget," Mick Mulvaney Mick MulvaneyMick Mulvaney to start hedge fund Fauci says positive White House task force reports don't always match what he hears on the ground Bottom line MORE, the director of the office, wrote in the memo dated Friday.

"Every penny we spend comes from the taxpayer. We thus owe it to the taxpayer to work as hard managing that money wisely as the taxpayer must do to earn it in the first place," he continued.

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Department and agency heads traveling on government-owned or leased planes or chartered aircraft for trips outside their official "mission requirement" will need approval from White House chief of staff John Kelly John Francis KellyMORE, Mulvaney said.

The White House budget chief said that "just because something is legal doesn't make it right," adding that "with few exceptions, the commercial air system used by millions of Americans every day is appropriate, even for very senior officials."

Various members of the president's Cabinet are under fire for their travel since taking public office, with Price on Friday resigning as head of the Department of Health and Human Services (HHS) after it was revealed he traveled on private jets for work, costing hundreds of thousands of dollars.

Interior 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 and Environmental Protection Agency Administrator Scott Pruitt Edward (Scott) Scott PruittJuan Williams: Swamp creature at the White House Science protections must be enforceable Conspicuous by their absence from the Republican Convention MORE are also facing questions about their use of private aircraft for government business, while Veterans Affairs Secretary David Shulkin David Jonathon ShulkinVA inspector general says former top official steered M contract to friend Schumer demands answers in use of unproven coronavirus drug on veterans Former Trump VA secretary says staffer found plans to replace him in department copier MORE spent nearly half his time on a recent international trip sightseeing and shopping with his wife, who had her airfare paid for by the government, The Washington Post reported.