One of the co-founders of the Medellin drug cartel has written to the Colombian president asking to be returned to his home country.
Carlos Lehder was extradited to the US in 1987, where he is serving a 55-year sentence for drug smuggling.
Lehder argues he should have been released two years ago.
He says he struck a deal to have his sentence reduced in return for his testimony against the former Panamanian leader Manuel Noriega.
