 His successor, conservative Felipe Calderón, also of the PAN, embarked on a war against drug mafias in Mexico that is still continuing, resulting in tens of thousands of deaths.In the face of the drug wars, the PRI returned to power in 2012, under Enrique Peña Nieto, promising that the party had reformed itself.Violence and corruption, however, continued, and uncertainty about the fate of the NAFTA complicated the situation.