House Oversight and Government Reform Committee Chairman Trey Gowdy Harold (Trey) Watson GowdySunday shows preview: Election integrity dominates as Nov. 3 nears Tim Scott invokes Breonna Taylor, George Floyd in Trump convention speech Sunday shows preview: Republicans gear up for national convention, USPS debate continues in Washington MORE (R-S.C.) is requesting detailed answers from Environmental Protection Agency (EPA) 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 over his consistent use of first- and business-class travel on government-funded trips.

In a letter addressed to Pruitt on Tuesday, the Republican congressman points out concerns over the EPA chief's reported use of a "blanket waiver" to fly first class, a method he calls prohibited.

"Clearly, federal regulations prohibit a blanket waiver to fly first class except to accommodate disabilities or special needs. Instead, a waiver for each flight is required in order to fly first or business class when traveling on official government business," Gowdy wrote.

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Gowdy also requested details on all air travel that Pruitt has taken since being sworn in as President Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE's EPA chief last year, asking Pruitt to detail flight destinations, costs, travel companions — including security detail — and the official reason for his travel.

The Oversight chairman additionally asked Pruitt to provide all documentation of individual or blanket waivers he received for his travel.

Gowdy requested all of the details be provided to the committee by March 6.

The EPA did not return The Hill's request for comment.

Gowdy announced late last month that he would retire from Congress, becoming the latest GOP chairman to opt not to seek reelection. The surprise announcement came months after he took over the helm of the Oversight panel.

The South Carolina Republican, who is perhaps best known for overseeing the House Intelligence Committee investigating former Secretary of State Hillary Clinton Hillary Diane Rodham ClintonJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Momentum growing among Republicans for Supreme Court vote before Election Day Warning signs flash for Lindsey Graham in South Carolina MORE's handling of the Benghazi attacks, said he would return to working in the justice system.

Pruitt has made headlines in the past few months over news that he primarily uses first class and business class when flying, including on short destination flights such as between Washington, D.C., and New York City.

Last week, EPA spokesperson Jahan Wilcox told The Hill that Pruitt used a "blanket waiver" that allowed him to fly first class. He later amended the statement to Politico, saying the EPA submitted a waiver for Pruitt on every trip.

The law stipulates that government employees must fly coach unless they are granted a specific waiver.