Drug lord Rafael Caro Quintero sent President Enrique Peña Nieto a letter asking for a "fair trial" and urging the head of state to not yield to pressure from the United States, where he is wanted on federal charges, Attorney General Jesus Murillo said Tuesday.

The AG told reporters that he and Government Secretary Miguel Angel Osorio Chong also received copies of the letter.

The letter is "a matter that should be addressed in the judicial area," Murillo said.

Caro Quintero, who founded the defunct Guadalajara drug cartel, was released from prison in August after a judge threw out the charges against him.

The 61-year-old Caro Quintero was serving time for the 1985 murders of U.S. Drug Enforcement Administration agent Enrique Camarena and pilot Alfredo Zavala Avelar.

Caro Quintero's whereabouts is not known.

An arrest warrant was issued for Caro Quintero a few days after his release from prison so he could be extradited to the United States.

On Nov. 6, the Supreme Court overturned the ruling that voided Caro Quintero's murder conviction and led to his release after 28 years in prison.

Caro Quintero, considered one of Mexico's most powerful drug traffickers in the 20th century, disappeared after leaving a penitentiary in the western state of Jalisco in the early hours of Aug. 9.

The drug trafficker alleges in the letter that he and his family are victims of an "absurd persecution" by the United States, the weekly magazine Proceso, which received a copy of the missive, reported.

Caro Quintero contends that he has paid the debt he owed society and demands that his "case be reviewed with justice," Proceso said.

The U.S. State Department is offering a reward of up to $5 million for information leading to the arrest of Caro Quintero, a native of Sinaloa state.

Caro Quintero is wanted by a court in California and considered a fugitive from justice. 

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