Photo provided by the Mexican Presidency shows Mexican President Enrique Pena Nieto (L) shakes hands with U.S. President Barack Obama during a bilateral meeting at the National Palace in Mexico City, capital of Mexico, on May 2, 2013. Obama visits Mexico to meet with Pena Nieto and analyze matters concerning education, infrastructure, commerce, migration and security, according to the local press. (Xinhua/Mexican Presidency)

Mexican President Enrique Pena Nieto speaks during a joint press conference with U.S. President Barack Obama after a bilateral meeting at the National Palace in Mexico City, capital of Mexico, on May 2, 2013. Obama visits Mexico to meet with Pena Nieto and analyze matters concerning education, infrastructure, commerce, migration and security, according to the local press. (Xinhua/David de la Paz)

U.S. President Barack Obama speaks during a joint press conference with Mexican President Enrique Pena Nieto after a bilateral meeting at the National Palace in Mexico City, capital of Mexico, on May 2, 2013. Obama visits Mexico to meet with Pena Nieto and analyze matters concerning education, infrastructure, commerce, migration and security, according to the local press. (Xinhua/David de la Paz)

Mexican President Enrique Pena Nieto (R) and U.S. President Barack Obama attend a joint press conference after a bilateral meeting at the National Palace in Mexico City, capital of Mexico, on May 2, 2013. Obama visits Mexico to meet with Pena Nieto and analyze matters concerning education, infrastructure, commerce, migration and security, according to the local press. (Xinhua/David de la Paz)