The Department of Justice gave special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE the authority to look into allegations of collusion between President Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE's former campaign chairman, Paul Manafort Paul John ManafortOur Constitution is under attack by Attorney General William Barr Bannon trial date set in alleged border wall scam Conspicuous by their absence from the Republican Convention MORE, and the Russian government, according to reports.

The detail was included in a court filing Monday night in which Mueller's team defended its investigation, The Associated Press reported.

The filing says Deputy Attorney General Rod Rosenstein Rod RosensteinDOJ kept investigators from completing probe of Trump ties to Russia: report Five takeaways from final Senate Intel Russia report FBI officials hid copies of Russia probe documents fearing Trump interference: book MORE wrote in a memo last year regarding the special counsel's investigation that Mueller could investigate whether Manafort "committed a crime or crimes by colluding with Russian government officials."

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According to the AP, Rosenstein, who appointed Mueller, also said in the memo that Mueller could look into payments Manafort got from the Ukrainian government when former Ukrainian President Viktor Yanukovych was in office.

Prosecutors said in their court filing that they would "naturally look into any interactions they may have had before and during the campaign to plumb motives and opportunities to coordinate and to expose possible channels for surreptitious communications."

"And prosecutors would naturally follow the money trail from Manafort’s Ukrainian consulting activities,” they wrote.

The filing came after Manafort requested that a judge dismiss an indictment against him regarding activities prior to the 2016 presidential election, saying Mueller had exceeded his authority.

Manafort was indicted last year on money laundering charges and other alleged financial crimes.

Mueller is currently investigating Russian election interference and possible ties between the Trump campaign and Moscow.

Trump has repeatedly dismissed the probe as a witch hunt and has denied collusion between his campaign and Russia.