Manafort’s civil lawsuit, filed in US District Court for the District of Columbia, named both Mueller and Deputy Attorney General Rod Rosenstein, who appointed Mueller in May and is tasked with overseeing the special counsel’s operations.
It accused Rosenstein of exceeding his legal authority to “grant Mr. Mueller carte blanche to investigate and pursue criminal charges in connection with anything he stumbles across.”
Manafort and his business partner Rick Gates were indicted in October by Mueller’s office on charges including conspiracy to launder money, conspiracy against the United States and failing to register as foreign agents of Ukraine’s former pro-Russian government.
The indictment did not make reference to any activity related to Manafort’s work on the Trump 2016 presidential campaign.
The lawsuit on Wednesday asked the court to have the case against Manafort dismissed.
A spokeswoman for the Justice Department called the lawsuit “frivolous,” but added that Manafort was “entitled to file whatever he wants.”
A spokesman for Mueller’s office declined to comment.
Rosenstein appointed Mueller in May, shortly after Trump fired former FBI Director James Comey.
Comey has since said he believes he was fired because Trump wanted to undermine the investigation into possible collusion between the campaign and Russia.
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Trump has denied that his campaign colluded with Russia, although he has also said he fired Comey because of “this Russia thing.” Moscow has denied meddling in the 2016 US election campaign.
Rosenstein is in charge of overseeing Mueller’s operations because Attorney General Jeff Session is recused from the Russia investigation.
Under the terms of Rosenstein’s order appointing Mueller, the special prosecutor can not only probe links or coordination between Trump’s campaign and Russia but look into “any matters that arose or may arise directly” from the investigation.
Manafort’s attorneys argued that Rosenstein’s order cast too wide a net for Mueller’s probe.
“The investigation has focused on Mr. Manafort’s offshore business dealings that date back to as early as 2005-about a decade before the Trump presidential campaign launched,” the lawsuit said.
It also alleged that the appointment order by Rosenstein was “arbitrary” and “capricious” and needed to be set aside.
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