Paul Manafort was jailed Friday on new charges of witness tampering filed against him last week by special counsel Robert Mueller.
The former Trump campaign chairman was arraigned after his indictment on the new charges, and a judge granted Mueller's request for Manafort's $10 million bail to be revoked.
One of the conditions of his bail was that he could not commit any new crimes, and the judge agreed there was reason to believe Manafort had violated those terms.
“This isn’t middle school," said U.S. District Judge Amy Berman. "I can’t take your phone.”
The indictment accuses Manafort of attempting to influence potential witnesses in a sprawling case against him while he awaits trial under house arrest.
Mueller claims the former Trump campaign chairman of sending an encrypted message to a witness connected to his lobbying in Ukraine for pro-Kremlin president Viktor Yanukovych.
Manafort's longtime associate Konstantin Kilimnik -- known as his "Russian brain" -- was also charged with witness tampering in the same indictment.
His former lieutenant Rick Gates has pleaded guilty to conspiracy against the United States and to lying to investigators, and he has agreed to cooperate in the Mueller investigation.