NEW YORK/WASHINGTON (Reuters) - A Democratic U.S. congressman is asking the Department of Energy’s watchdog to investigate Energy Secretary Rick Perry’s travel on chartered aircraft, the congressman said at a hearing on Thursday.

U.S. Energy Secretary Rick Perry attends the opening of the International Atomic Energy Agency (IAEA) General Conference at their headquarters in Vienna, Austria September 18, 2017. REUTERS/Leonhard Foeger - RC1CA368F630

U.S. Representative Frank Pallone said Perry’s trips on chartered planes need scrutiny in light of the “extreme” budget cuts the department faces in a 2018 federal budget proposed by Republican President Donald Trump.

In a letter on Thursday to the Energy Department’s inspector general, Pallone cited a $35,000 trip Perry took from Washington to a private airport in Kansas that was within a 45-minute drive of Kansas City International Airport.

“It is unclear why Secretary Perry would require such costly travel in instances where more economical options were readily available,” Pallone wrote.

Perry said in his opening statement to the U.S. House of Representatives’ Energy and Commerce Subcommittee on Energy hearing, that as a former Texas governor he understood the issue of travel oversight and the need to spend money on travel appropriately and thoughtfully.

“I travel a lot to do my job. I do it in a way that I think is thoughtful,” he said.

Perry’s charter flights have cost taxpayers more than $56,000, according to records the Energy Department released to Reuters on Friday. One of those flights - from a coal mine in Pennsylvania to a nuclear facility in Ohio - occurred just a day before former U.S. Health and Human Services Secretary Tom Price resigned and promised to repay the government for some $52,000 worth of travel including private flights.

Perry said on Thursday it would have been “very difficult” to take a commercial flight from the Pennsylvania site to the Ohio plant.

Pallone’s letter, which Democratic Representatives Diana DeGette and Bobby Rush also signed, asked the inspector general to determine whether there was a “mechanism for Secretary Perry to reimburse taxpayers” for the flights if they failed to meet ethical and procedural criteria for government travel.

A spokeswoman for the inspector general’s office said the office had received the letter and the inspector-general was reviewing its contents.

Inspectors general for the U.S. Environmental Protection Agency and the U.S. Interior Department have opened similar investigations into charter travel by Trump’s EPA Administrator Scott Pruitt and Interior Secretary Ryan Zinke.