SAN DIEGO (Border Report) -- Boxer Julio Cesar Chavez Jr., who was deported from the U.S. earlier this week, is accusing the Mexican government of violating his fundamental rights by keeping him in isolation and not allowing his lawyers and family to visit him in prison.

He is the son of Mexican boxing legend Julio Cesar Chavez.

Chavez Jr. is being held at a prison in the Mexican city of Hermosillo, Sonora.

Two days ago, he filed a formal complaint against the facility and the Mexican government accusing them of mistreatment and not allowing him access to "an adequate defense."

Chavez Jr. is charged with being part of a Sinaloa cartel faction led by the sons of Joaquin "El Chapo" Guzman.

He is also accused of trafficking weapons, ammunition and explosives.

On Aug. 23, Chavez Jr., is

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