WASHINGTON (AP) — A federal judge on Monday set a sentencing date for a former campaign aide to District of Columbia Mayor Vincent Gray, despite a prosecutor’s request to not schedule the hearing because the investigation is continuing.

U.S. District Judge Colleen Kollar-Kotelly scheduled a Sept. 24 sentencing for Howard Brooks, who pleaded guilty last month to lying to the FBI about under-the-table payments made to a minor candidate in the 2010 mayoral race. Brooks is one of two former campaign aides to plead guilty in an ongoing federal investigation into the campaign.