Allegations that U.S. agents spied on Mexico’s President Enrique Pena Nieto when he was a candidate during last year’s campaign have led Mexico to summon U.S. Ambassador Anthony Wayne and demanded “a thorough investigation.”

Mexico’s foreign ministry says that “alleged espionage activity involving Mexican citizens” is against international law and the charter of the United Nations.

The charges that the National Security Agency spied on Nieto were broadcast over the weekend in Brazil, where reports also claim that the U.S. spied on Brazil’s President Dilma Rousseff.

via Mexico Summons U.S. Ambassador, Seeking Answers To Spying Claims : The Two-Way : NPR.