Washington (CNN) Special counsel Robert Mueller's office is considering bringing more criminal charges against Paul Manafort, after it accused the former Trump campaign chairman of violating his plea deal to cooperate with prosecutors.

The announcement came at a half-hour court hearing Friday morning, where Manafort's team learned that his sentencing for conspiracy and witness tampering will happen on March 5, 2019.

The hearing came just days after special counsel prosecutors said they believe Manafort lied during his interviews with investigators following his guilty plea in September. The special counsel's office may have to turn over evidence backing up its claim in the coming weeks.

Such a move could give Manafort's legal team, and in theory, President Donald Trump's lawyers if they are still in touch, a new window into some of the information Mueller has collected during the investigation.

Manafort pleaded guilty earlier this year to two charges of conspiracy and witness tampering, while publicly admitting he committed several other financial and lobbying crimes. He separately was found guilty by a jury in Virginia of eight financial fraud charges related to his Ukrainian lobbying proceeds.

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