Department of Justice officials are asking FBI investigators at Attorney General Jeff Session's request to describe evidence uncovered in an investigation into the sale of a uranium mining company, NBC News reported early Thursday.

A senior Justice Department official told the news outlet that the questions stem from an assistant attorney general's pledge to analyze whether a special counsel is warranted.

The inquiry relates to the 2010 sale of Uranium One, a Canada-based firm with holdings in the U.S., to Rosatom, a Russian state-owned nuclear energy agency.

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President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE and some Republicans have used the deal in an attempt to discredit Hillary Clinton Hillary Diane Rodham ClintonDemocratic groups using Bloomberg money to launch M in Spanish language ads in Florida The Hill's Campaign Report: Presidential polls tighten weeks out from Election Day More than 50 Latino faith leaders endorse Biden MORE, because the sale occurred when the former Democratic presidential nominee was head of the State Department. Clinton has denied that she was part of the deal’s negotiations.

The sale was subject to approval by a nine-agency panel, which included the State Department. The State Department official who was part of the agency’s approval said Clinton did not interfere in the dealings, NBC News noted.

Trump has used the renewed scrutiny surrounding the deal to push back against the investigation into Russia’s election meddling, including any potential ties between Trump campaign staff members and Moscow.