A man indicted in the United States for allegedly smuggling heroin, in a case that was the basis for the TV hit "Orange Is The New Black," has been elected a senator in Nigeria.

Buruji Kashamu was little known before he returned home in 2003 from Britain, despite a U.S. extradition order, to become a major financier of President Goodluck Jonathan's party.

Election results posted late Wednesday identify Kashamu as senator-elect in southwest Ogun state. Opponents are challenging his victory in court, saying ballots were rigged.

Kashamu, 56, hung up the phone twice when The Associated Press called Thursday for comment about the drug case. Kashamu has said he is "a clean businessman" and that the 1998 indictment by a grand jury in the Northern District of Illinois for conspiracy to import and distribute heroin in the United States is a case of mistaken identity. He has said Chicago prosecutors really want the dead brother he closely resembles.

A British court refused a U.S. extradition request in 2003 over uncertainty about Kashamu's identity. Chicago Judge Richard Posner refused a motion to dismiss Kashamu's case last year.

A dozen people were long ago tried and jailed in the case, including American Piper Kerman, whose memoir about her jail time became the Netflix hit "Orange Is The New Black." Kerman's book never identified Kashamu by name, but there is a West African drug kingpin whom she calls "Alhaji" -- meaning one who has completed the haj or pilgrimage to Mecca.

A Nigerian federal court last year ordered Kashamu's extradition, an order upheld by an appeals court. But Nigeria's government has not extradited him.

That failure caused Olusegun Obasanjo, a former president, to warn that "drug barons ... will buy candidates, parties and eventually buy power or be in power themselves."

Jonathan's perceived protection of Kashamu was a factor that led Obasanjo to defect from the ruling party.

Kashamu is suing Obasanjo for libel for stating that Kashamu is a fugitive from U.S. justice. He had won a court order halting publication of Obasanjo's autobiography but a judge this week rescinded it, saying Kashamu had misled the court.

President-elect Muhammadu Buhari, a former military dictator, has promised to fight corruption. That has alarmed many politicians in a country where corruption is endemic.