AdvertisementMexico Summons U.S. Ambassador, Seeking Answers To Spying ClaimsSeptember 03, 2013Bill ChappellfacebookEmailNew reports allege that the NSA spied on Mexican President Enrique Pena Nieto, seen here walking with President Barack Obama in June, when he was a candidate for office. Mexico and Brazil have demanded a response to charges of U.S. spying on their internal affairs. (AFP/Getty Images)