Roger Stone wants President Trump to appoint a special prosecutor to investigate Hillary Clinton’s role in approving the Uranium One deal while she was secretary of State.

“You would immediately have to inform [special counsel Robert] Mueller, [former FBI Director James] Comey, and [Deputy Attorney General] Rod Rosenstein that they are under federal investigation,” Stone told Vanity Fair. “Trump can’t afford to fire Mueller politically. But this pushes him aside.”

In 2010, a Russian state-owned energy company acquired a major stake in Canadian-based company Uranium One, which had mining licenses for about a fifth of U.S. uranium extraction capacity. The Obama administration approved the deal while Clinton led the State Department and Mueller was FBI director.

Individuals with connections to Uranium One donated millions to the Clinton Foundation and former President Bill Clinton was paid $500,000 from a Russian bank to give a speech in Moscow in 2010.

Trump and his allies have cited the controversial deal as Mueller’s investigation into Russia’s meddling in the 2016 election heats up.

Republicans last month announced the launch of an investigation into the deal after reports suggested Russia was working to blackmail people in America to further Moscow’s pursuit of atomic energy interests in the U.S.