(CNN) Paul Manafort, the former Trump campaign chairman indicted on money laundering and other charges, filed a lawsuit challenging the broad authority of special counsel Robert Mueller and alleging the Justice Department violated the law in appointing Mueller.

The suit brought Wednesday in US District Court in Washington, where Manafort and another former Trump campaign aide are charged, challenges Mueller's decision to charge Manafort with alleged crimes that they say have nothing to do with the 2016 campaign, but rather relate to lucrative lobbying work Manafort and his deputy did for a former Russia-friendly government in Ukraine. That work ended in 2014, the suit says. Manafort and his deputy Rick Gates deny the allegations in the charges.

The legal action represents a new tack in a broader effort by supporters of the President to push back on the special counsel. Some Republicans have begun publicly calling for Mueller's probe to be shut down. Manafort's attorneys have echoed the President's criticism that Mueller's investigation into Russian meddling in the 2016 election is pursuing crimes that never happened.

The Manafort lawsuit alleges Deputy Attorney General Rod Rosenstein and Mueller have unlawfully exceeded the authorities allowed under the law governing special counsel appointments. The lawsuit contends that the order Rosenstein signed to appoint Mueller "exceeds the scope of Mr. Rosenstein's authority to appoint special counsel as well as specific restrictions on the scope of such appointments."

A DOJ spokesperson responded with a statement, saying: "The lawsuit is frivolous but the defendant is entitled to file whatever he wants."

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