(CNN) Prosecutors from special counsel Robert Mueller's office wrote in a sentencing memo filed Friday for Paul Manafort that the former Trump campaign chairman's years of criminality were "bold" and continued even when and after he served as Donald Trump's campaign chair in the 2016 election.

The memo was made public Saturday with some redactions, and prosecutors asked Judge Amy Berman Jackson to make sure the now-jailed 69-year-old may never walk free again.

Manafort pleaded guilty in September to conspiracy against the US and conspiracy witness tampering. At the time of his plea, Manafort also admitted to a litany of money laundering and foreign lobbying crimes that encompassed his work for Ukrainian politicians and other clients over several years.

The prosecutors specifically note that they don't believe Manafort accepted responsibility for his crimes, and there's no reason his agreement to plead guilty and cooperate should help him at sentencing. Even after he broke the plea deal, there was some question about whether Manafort had accepted responsibility in the eyes of the court and the prosecutors because of his admissions to so many crimes.

The special counsel's office wrote that "Manafort's conduct after he pleaded guilty is pertinent to sentencing. It reflects a hardened adherence to committing crimes and lack of remorse."

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