Federal prosecutors notified Paul Manafort in August that he would be indicted as part of an investigation into ties between Russia and the Trump campaign, according to court documents filed Thursday.

Manafort, President Trump’s former campaign chairman, pleaded not guilty Monday to charges including tax fraud and money laundering. Richard Gates, Manafort’s former business associate, was also charged in special counsel Robert Mueller's probe.

Kevin Downing, Manafort’s attorney, filed paperwork Thursday in U.S. district court arguing that his client isn’t a flight risk.

Prosecutors requested Manafort be released on house arrest, arguing he is a flight risk because of the seriousness of the charges and the extent of his ties abroad. Bail was set at $10 million.

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Downing, however, argued Manafort has been aware of Mueller’s investigation “for many months.” He cited a search warrant executed at Manafort's Virginia residence in July and said that prosecutors told Manafort in August he’d be indicted, which The New York Times reported in September.

“During this investigation period, Mr. Manafort traveled overseas on business and, to no one’s surprise, he returned to the United States,” Downing said.

He added that Manafort has strong family and community ties and suggested the $10 million bail is sufficient.

Prosecutors on Tuesday filed their own paperwork arguing Manafort and Gates pose flight risks. The filing cites Manafort's multiple passports and use of multiple banks to house millions of dollars gained through work for a pro-Russia political party in Ukraine.

Manafort is due to appear in court on Thursday.