U.S. Rep. Jesse Jackson Jr., D-Chicago, is the subject of a criminal investigation by the FBI into allegations he misused campaign dollars to decorate his home, according to the Wall Street Journal.

The newspaper reports the investigation is nearing completion.

Attorneys for Jackson asked Justice Department officials to delay any indictment until after the November election but those officials refused, the Wall Street Journal reported citing "people familiar with the matter."

Jackson representatives did not respond to requests for comment from the Wall Street Journal on the report.

Jackson has not been seen in public since June. Weeks of questioning followed as to his whereabouts and intentions to retain his congressional post. Under mounting pressure, his office eventually revealed he entered the Mayo Clinic for treatment of a bipolar disorder.

The Wall Street Journal report says the investigation into the misuse of campaign funds began before Jackson entered treatment.

Jackson was released from the Mayo Clinic last month and returned to his home in Washington D.C. He and his wife, Chicago Alderman Sandi Jackson, put the home on the market for $2.5 million, citing the need to liquidate the asset to pay for mounting medical bills.

But the home was soon removed from listings, with Jackson representatives saying the release of photos of the home created a potential security risk for the high-profile family.

The new probe is not related to former Gov. Rod Blagojevich's attempts to sell the U.S. Senate seat left vacant when Barack Obama was elected president in 2008. Jackson maintained his innocence in the Senate seat investigation.

Jeanette is a journalist with The Times Media Co. who has worked as both a reporter and editor. She has a master's degree in public affairs reporting from the University of Illinois at Springfield.