Fox 5 News reports that he is accused of violating terms of a protective order of consent leading up to his corruption trial.
The judge, U.S. District Judge Stephen C. Robinson, accused Kerik of giving information that had been sealed to the trustee of his legal defense fund. The trustee leaked the information to a newspaper.
AP notes that the information in question was not published. Anthony Modafferi, the trustee of Kerik's legal defense fund -- whose Web site is down but can be seen here -- allegedly passed information about the case to the Washington Times.
The New York Times has color from the courtroom today, where the judge blasted Kerik as a "toxic combination of self-minded focus and arrogance."
Here's our post from last December on a $75-a-plate-minimum beefsteak dinner thrown by the legal defense fund in Kerik's honor.
Kerik faces two other trials, one having to do with tax evasion, and the other with lying to the White House while being vetted to be George W. Bush's Secretary of Homeland Security.
Kerik's attorneys did not immediately respond to our requests for comment.