The Department of Energy (DOE) appears to have reimbursed one of its contractors millions of dollars for legal expenses from fighting whistleblower retaliation claims, a pair of Senate Democrats say.

Sens. Claire McCaskill Claire Conner McCaskillMomentum growing among Republicans for Supreme Court vote before Election Day Democratic-linked group runs ads in Kansas GOP Senate primary Trump mocked for low attendance at rally MORE (Mo.) and Ron Wyden Ronald (Ron) Lee WydenGOP set to release controversial Biden report Democrats fear Russia interference could spoil bid to retake Senate GOP senator blocks Schumer resolution aimed at Biden probe as tensions run high MORE (Ore.) asked about the situation in a Tuesday letter to Energy Secretary Rick Perry Rick PerryOVERNIGHT 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 OVERNIGHT ENERGY: Trump signs major conservation bill into law | Senate votes to confirm Energy's No. 2 official | Trump Jr. expresses opposition to Pebble Mine project Senate votes to confirm Energy's No. 2 official MORE, citing documents that appear to show that the National Nuclear Security Administration (NNSA) paid more than $24 million to the partnership of Lawrence Livermore National Laboratory for costs from a series of whistleblower cases.

Rules generally prohibit contractors from recovering such costs from federal agencies.

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“Whistleblowers are an invaluable resource for weeding out waste, fraud and abuse — the last thing the government should be doing is paying the legal fees of contractors who’ve retaliated against whistleblowers,” McCaskill, the top Democrat on the Senate Homeland Security and Governmental Affairs Committee, said in a statement.

“The Department of Energy needs to justify why it spent taxpayer dollars on reimbursing this contractor. And if it can’t, it needs to get that money back now.”

DOE and the Lawrence Livermore partnership did not return requests for comment on the senators’ letter.

The documents Wyden and McCaskill cite came from ongoing litigation involving a whistleblower, and they did not disclose the litigant in the case.

They say that in eight lawsuits, four of which are ongoing, NNSA let the contractor charge millions of dollars to the agency for costs that went to outside law firms.

McCaskill, Wyden and other senators with significant DOE operations in their states have long been pushing for the agency to crack down on whistleblower retaliation. They say that federal reimbursement for such legal costs makes crackdowns harder.

A 2016 report from the DOE’s Inspector General found various problems with how DOE determines whether to reimburse legal and settlement costs, while a Government Accountability Office report that year found that the agency inconsistently used its enforcement authority on contractors who retaliated.

The senators asked DOE in their letter to explain the costs that the NNSA did reimburse for and what the agency is doing to comply with the prohibitions on certain payments.