The Interior Department’s office of inspector general is investigating 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’s use of chartered planes, a department spokesperson confirmed.

Nancy K. DiPaolo, spokeswoman for Interior’s inspector general's office, said the office began its investigation into the use of the chartered jets late last week.

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Politico, which also broke the news of the inspector general's investigation, first reported last week that Zinke and his aides had taken multiple flights on chartered or military planes to travel to his home state of Montana, as well as to travel to events between two Caribbean islands.

He also used a military plane in August to survey wildfires in Montana with Department of Agriculture Secretary Sonny Perdue George (Sonny) Ervin PerduePerdue has found the right path in National Forests Democrats seek clarity on payroll tax deferral for federal workers USDA extending free meals for kids through end of the year if funding allows after criticism MORE. Both agencies plan to reimburse the Air Force for the use of the plane.

Zinke called the reports “a little BS,” saying last week that he used the planes only when “no commercial options existed” to fit the schedule.

“The flights were only booked after extensive due diligence by the career professionals in the department’s general law and ethics division,” he said.

Zinke is the latest Trump administration official to face scrutiny over his travel.

Former 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 Friday after it was revealed he had spent more than $400,000 in taxpayer funds on private jets for government travel.

Treasury Secretary Steve Mnuchin 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 have also used noncommercial travel while working in the Trump administration.