A federal judge has scheduled a hearing for former D.C. Council Chairman Kwame Brown to review an unknown "violation."

U.S. District Judge Richard Leon has ordered Brown, who pleaded guilty in June to bank fraud, to appear in court on Oct. 9. In the docket entry announcing the hearing, first reported by the Legal Times, Leon did not detail the circumstances that prompted the session.

A spokesman for U.S. Attorney Ronald Machen declined to elaborate Wednesday, and Brown's lawyer did not immediately respond to a request for comment.

Brown is awaiting sentencing on the bank fraud charge, a federal felony, as well as a local D.C. campaign finance count.

Hours after prosecutors filed the bank fraud charge on June 6, Brown resigned as the city's second-ranking official. In court, Brown acknowledged that he lied about his income to secure two loans, one of which he used to purchase a boat he named "Bullet Proof."

Prosecutors also charged Brown with "aiding and abetting" cash expenditures of more than $50 from an account linked to his campaign.

Brown had been scheduled for a Sept. 20 sentencing, but prosecutors earlier this month asked Leon to postpone it so the ex-chairman could "complete his cooperation" with federal authorities.

Under the term of his plea deal, Brown pledged to assist law enforcement in ongoing investigations.

Leon rescheduled Brown's sentencing for Nov. 13.