Washington (CNN) Special counsel Robert Mueller has no current plans to bring new charges against former Trump campaign chairman Paul Manafort for allegedly breaching his plea deal, a federal prosecutor said in Friday federal court hearing.

Manafort, appearing in public for the first time since October, used a cane and sat slouched forward at the defense table. His hair is now virtually white. He was allowed to wear a suit rather than his dark green inmate uniform.

District Judge Amy Berman Jackson said she will determine whether Manafort lied when he was cooperating with Mueller -- something that could impact a future prison sentence.

Berman Jackson asked special counsel prosecutor Andrew Weissmann to address if he plans to charge Manafort with additional charges related to his alleged breach of plea.

"We don't currently intend to do that," Weissmann said. But he did not rule out the possibility in the future.

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