The Department of Justice has released the financial disclosures of special counsel Robert Mueller, Politico reported on Tuesday.

The disclosure shows that Mueller made just under $3.5 million through his work at the law firm that employed him prior to his appointment to serve as the special counsel investigating Russia’s election meddling.

Mueller’s clients at WilmerHale included Apple, Sony Pictures, Intel, Facebook and the National Football League.

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The disclosure comes as Mueller continues the probe into Russia’s attempts to interfere in the presidential election and any potential ties between President Trump’s campaign staff members and the Kremlin.

The Justice Department appointed Mueller to conduct the investigation in May, days after Trump fired FBI Director James Comey.

Mueller, who previously served as the FBI director under former Presidents George W. Bush and Barack Obama Barack Hussein ObamaMomentum growing among Republicans for Supreme Court vote before Election Day Warning signs flash for Lindsey Graham in South Carolina Majority of voters say Trump should not nominate a Supreme Court justice: poll MORE, also gave paid speeches following his exit from the federal government.