In a short but fiery hearing involving Robert Mueller's special counsel team Monday, a federal judge admonished an attorney representing a Russian firm, calling his behavior "unprofessional, inappropriate and ineffective."
Citing what she called "meritless personal attacks" on the special counsel's office in court filings, U.S. District Judge Dabney Friedrich told Eric Dubelier, lead counsel for the Russian firm, Concord Management and Consulting, LLC, to "knock it off."
In a defiant response, Dubelier said he was merely "telling the truth" and said it was only the judge's opinion that his remarks had been unprofessional.
Dubelier, an attorney at Reed Smith, accused the judge of showing "some bias" against him and, because of that, he said, he would have to confer with Concord about whether he should continue to represent them.
Dubelier is known for filing colorful motions that have included sarcastic quips and quotes from pop culture. Most recently, on Friday Dubelier quoted the 1970s movie "Animal House" in criticizing a special counsel motion.
"Flounder, you can't spend your whole life worrying about your mistakes! You f**ked up... you trusted us. Hey, make the best of it," read the quote.
On Monday, Friedrich said "clever quotes from movies [or] cartoons" will not be effective in persuading the court.
Concord and the special counsel for weeks have been locked in an argument over whether Concord's attorney can share some information -- marked "sensitive" by the government -- with officers of Concord, including Yevgeniy Prigozhin, known to be an associate of Russian President Vladimir Putin.
The question of how sensitive information is shared is a critical one both to the case and to the broader Mueller investigation. Previously, legal and national security experts told ABC News there was a concern that information provided to Concord for their defense could end up at the Kremlin, exposing U.S. secrets to an adversary.
Before sealing the courtroom from the public so the two sides could discuss the discovery question, Friedrich set the next court hearing for the case for March 7.