Secretary of Health and Human Services Tom Price resigned Friday following reports that he spent more than $1 million in taxpayer money on chartered and military flights for official travel across the United States.

Days before Prices departure, President Donald Trump had said he was not happy about the secretarys unnecessary spending, and hours before Prices resignation, the president added, Im disappointed in him.

Prices departure, however, wont bring an end to questions about Trump administration officials spending of public funds on expensive travel. Trump may have promised to drain the swamp, but several Cabinet secretaries appear to fit in comfortably.

Treasury Secretary Steven Mnuchin is being investigated by the Treasury Departments inspector general for opting to use a government jet to commute from New York to D.C. after an August news conference in Trump Tower, ABC reported last week. The trip of less than an hour cost at least $25,000.

Investigators are also exploring why Mnuchin requested the use of an Air Force jet to travel on his honeymoon to Europe over the summer.

The Treasury Department launched its probe after Munchins wife, Louise Linton, posted a photo to Instagram of the couple disembarking from a military plane in Kentucky on the day of the solar eclipse. In the comments, Linton flaunted her lavish lifestyle and later berated a woman who criticized her for sharing the image along with tags on which designer items she was wearing.

A spokesman for the Treasury Department told ABC that the honeymoon request was eventually withdrawn and that the department welcomed the review.

Interior Secretary Ryan Zinke also has faced scrutiny for using military and private planes while traveling on official business. The Washington Post reported this week that Zinke and his staff traveled on chartered private planes between the islands of St. Croix and St. Thomas during a three-day trip to the U.S. Virgin Islands in March.

Politico and the Post also reported that Zinke and his entourage paid more than $12,000 for an oil companys plane to take them from Las Vegas to Montana in June.

The Interior Department said in a statement that Zinkes travel was completely compliant with all applicable laws, rules, and regulations, and claimed there were no commercial flights that fit the secretarys schedule.

EPA Administrator Scott Pruitt and members of his staff spent more than $14,000 on a chartered flight for stops in Oklahoma in July, CBS News revealed.

Since taking office in February, Pruitt racked up at least $58,000 in costs for four non-commercial flights, according to The Washington Post.