Rep. Jesse Jackson Jr. left the Mayo Clinic on Tuesday after his second treatment for bipolar disorder there since he took a leave of absence in June.
Mayo spokesman Nick Hanson said he did not know where Jackson was going after he left the Minnesota hospital.
Jackson returned to the hospital in October amid reports that he faced a new federal investigation into potential misuse of his campaign finances.
He remains under a U.S. House committee’s investigation into his dealings with imprisoned former Illinois Gov. Rod Blagojevich.