(CNN) The judge who will oversee Paul Manafort's trial in Washington has warned members of the defense team several times about their behavior in court, including on Tuesday morning at a hearing.

Judge Amy Berman Jackson's message is clear: She's closely watching Manafort's lawyers -- especially lead defense attorney Kevin Downing -- to make sure they don't act out.

"Mr. Downing, I just want to let you know that you are an expressive human being and how you feel about what is being said in the courtroom is a big part of your demeanor and your physical demeanor," she said to him at a behind-closed-doors court hearing months ago. The transcript was recently made public.

"That doesn't upset me particularly, but it will upset me enormously if there's a jury in the box. So just keep that in mind," she told him.

Berman Jackson echoed that message Tuesday in open court. "There are people who are very expressive in this courtroom about what they think about what I just said or what the government just said or what the defense just said, and that is not going to happen when there is a jury in the box. Please keep that in mind," she said, after an interruption from Downing.

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