Gander International Airport

The report cites 2012 documents from NSA leaker Edward Snowden indicating the U.S. monitored Pena Nieto's communications before he was elected in July 2012. ( JUSTIN TALLIS/AFP/Getty Images)

Mexican President Says NSA Spying Illegal, Demands Investigation

Mexican President Enrique Pena Nieto says reported surveillance by the U.S. National Security Agency would constitute an illegal act.