Attorney General Jeff Sessions Jefferson (Jeff) Beauregard SessionsRoy Moore sues Alabama over COVID-19 restrictions GOP set to release controversial Biden report Trump's policies on refugees are as simple as ABCs MORE has rejected a request from the House Oversight Committee to testify on a Justice Department operation from the Obama era, and will not answer any questions or send officials in his stead, the committee announced Wednesday.

The panel had asked Sessions to testify and answer questions related to President Obama's "Operation Fast and Furious," a botched law enforcement plan that resulted in untraceable guns being sent to criminal drug cartels. The failed operation was a chief source of Republican criticism for Sessions's predecessor, former Attorney General Eric Holder Eric Himpton HolderThe Hill's Campaign Report: Trump's rally risk | Biden ramps up legal team | Biden hits Trump over climate policy Biden campaign forming 'special litigation' team ahead of possible voting battle Pompeo, Engel poised for battle in contempt proceedings MORE.

The Justice Department on Monday sent a letter to the House Oversight Committee, explaining that ongoing litigation by committee Chairman Jason Chaffetz Jason ChaffetzThe myth of the conservative bestseller Elijah Cummings, Democratic chairman and powerful Trump critic, dies at 68 House Oversight panel demands DeVos turn over personal email records MORE (R-Utah) prevented the testimony, and saying that the department would not answer questions from other members while in “settlement discussions” with Chaffetz.

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“Under these circumstances, we are not in a position to provide additional information in response to your questions, nor to have a Department witness testify about them at a congressional hearing," the Justice Department wrote.

Investigations into Operation Fast and Furious ran through Holder's last months in office. In April, a man was arrested in Mexico for killing a U.S. Border Patrol agent with a government-issued gun during a firefight in 2010.

In total, the Justice Department lost 1,400 of the 2,000 guns they sold as part of Operation Fast and Furious. Two more of those guns were found at the scene of the firefight in 2010, exposing the agency's program and sparking national outrage.