Price said HHS takes those criticisms "very seriously".

President Donald Trump says he is "not happy" with his Health and Human Services Secretary Tom Price following reports that Price used a private plane for official business.

For Price's Nashville trip, which departed Washington Dulles International Airport just after 9 a.m. and touched down at 9:44 a.m., there were a handful of other commercial flight options that would cost $102 to $333 per person round trip, Politico reported.

The federal contract states it cost $17,760 for the roundtrip private flight, which left Washington Dulles at 9:12 a.m. ET and landed in Nashville at 9:44 a.m. CT. Politico found that there were two flights - American Airlines out of Reagan National Airport and Southwest out of Baltimore-Washington International - that had almost the same exact timelines. He had two official visits and then had lunch with his son during the trip, it said. HHS insists there were only 11 flights, related to hurricane travel and work on the opioid crisis.

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Price has come under review for his flying habits, as his department's inspector general's office is reviewing his use of government jets to see if it violated any government travel regulations.

While what Price did may be technically legal, it raises some eyebrows ethically, said Richard Painter, a top ethics official under President George W. Bush, particularly when business represents a disproportionate piece of the trip. Three Republican attempts to repeal it have failed, including one this week.

Price eventually sold his stake in the company during the HHS confirmation process and made a profit of at least $150,000, according to The Washington Post.