Mexican Attorney General Arturo Chavez has resigned after only 18 months on the job. He has been the subject of controversy ever since leaked Wikileaks cables were disclosed that cast him in a negative light.

One "embassy cable from September 2009 called Chávez Chávez's nomination "totally unexpected and politically inexplicable."

It noted that he "has strong detractors within the Mexican human rights community" because of botched prosecutions in the murders of women in the northern Mexico border city of Ciudad Juárez in the 1990s, when he was the top state prosecutor.

The cable suggested Chávez Chávez "is a less capable political operator, who will be overshadowed by García Luna and stymied by his considerable human rights baggage."

President Calderon has nominated a woman, Marisela Morales to replace him. She currently serves as the head of the organised crime special investigations unit.