The Environmental Protection Agency’s internal inspector general is again expanding its investigation into the travel habits of agency head 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.

An internal memo dated Jan. 10 alerts the agency of the amendment to the investigation, which expands the dates of travel covered in the probe to include Pruitt’s travel through the end of 2017. The memo noted that the decision to expand the probe came in response to “additional congressional requests.”

Sen. Tom Carper Thomas (Tom) Richard CarperDemocrat asks for probe of EPA's use of politically appointed lawyers Overnight Energy: Study links coronavirus mortality to air pollution exposure | Low-income, minority households pay more for utilities: report OVERNIGHT ENERGY: Democrats push resolution to battle climate change, sluggish economy and racial injustice | Senators reach compromise on greenhouse gas amendment stalling energy bill | Trump courts Florida voters with offshore drilling moratorium MORE (D-Del.) requested the investigation include Pruitt’s December trip to Morocco, which reportedly cost $40,000 in taxpayer dollars.

In a Dec. 18 letter to the inspector general, Carper wrote that one purpose of Pruitt’s trip was to promote natural gas exports and that the trip should be scrutinized because the EPA does not oversee natural gas.

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The inspector general's memo notes that the objectives of the investigation remain the same: determining the “frequency, cost and extent” of Pruitt’s travel and whether agency policies and procedures were followed.

This is the second time the inspector general has expanded its probe into Pruitt’s travel habits. The probe was originally limited to his travel via noncommercial flights through July 31, which had cost more than $58,000.

The investigation was expanded in October to include his taxpayer-funded flights through the end of September.

The office is also looking into Pruitt’s April meeting with a coal mining industry group and his decision to have a $25,000 soundproof phone booth installed in his office.

The use of private flights by officials has plagued the Trump administration.

Former Health and Human Services 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 last year over reports about his pricey travel habits and promised to pay back $52,000 to cover “his seat” on the flights.

And the Treasury Department has looked into a flight taken by Secretary Steven Mnuchin Steven Terner MnuchinLawmakers fear voter backlash over failure to reach COVID-19 relief deal United Airlines, unions call for six-month extension of government aid House Democrats plan to unveil bill next week to avert shutdown MORE that cost taxpayers at least $25,000.