Sinaloa cartel chief Joaquín “El Chapo” Guzmán has waged a months-long battle against extradition to the US.

The latest salvo came on Tuesday, when his lawyers filed another appeal at a court in Mexico City.

The appeal filed on Tuesday will be reviewed by a panel of judges, called a “college,” at the same court that on October 20 rejected a legal challenge to extradition filed by the kingpin.

In the wake of that rejection, Andrés Granados, one of Guzmán’s lawyers, told AFP that “We are not defeated.”

Thus far, Guzmán’s appeals have only succeeded in slowing the extradition, not stopping it.

It’s not yet known when the latest appeal will get a ruling, Guzmán’s attorneys have said they are prepared to take the case all the way up to the country’s Supreme Court.

“The attorneys have filed a number of … legal injunctions to preclude Chapo from being extradited. For each and every injunction, or amparo, that they file they have to have a judicial hearing, which takes time,” Mike Vigil, a former chief of international operations for the US Drug Enforcement Administration, told Business Insider.

Read the whole story at Business Insider.