Mexico has issued an arrest warrant for a former security minister wanted on corruption charges and may request his extradition from the United States where he is being held awaiting trial, an official told Reuters, the latter reported.

Ex-Security Minister Genaro Garcia Luna pled not guilty last month to US charges involving a multimillion-dollar bribery scheme allegedly designed to boost the Sinaloa cartel once headed by jailed drug lord Joaquin “El Chapo” Guzman.

The charge stems from Garcia Luna’s inability to show that more than $1 million in property acquisitions in Mexico were made lawfully, the official said.

Garcia Luna is accused of taking suitcases of cash from the Sinaloa cartel to ensure safe passage for its drugs as well as passing on information about its rivals.