Longtime Trump ally Roger Stone is calling for President Trump to appoint a special prosecutor for an investigation into Democratic presidential nominee Hillary Clinton Hillary Diane Rodham ClintonWhat Senate Republicans have said about election-year Supreme Court vacancies Bipartisan praise pours in after Ginsburg's death Trump carries on with rally, unaware of Ginsburg's death MORE.

Stone wants Clinton to be investigated regarding the part she played in the sale of Uranium One, Vanity Fair reported.

“You would immediately have to inform Mueller, Comey, and [Deputy Attorney General] Rod Rosenstein that they are under federal investigation,” Stone said.

“Trump can’t afford to fire Mueller politically. But this pushes him aside.”

Uranium One, which supplies a portion of the United States' uranium stockpile, was purchased by a subsidiary of a Russian state-owned energy company in 2010. Mueller was FBI director at the time.

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The sale was subject to the approval of the U.S. Committee on Foreign Investment, a multi-agency panel that includes the State Department, which was led by Clinton in 2010.

The Senate Judiciary Committee announced last month that it was opening an inquiry into the sale.