Heads of States and Governments listen to Mexican President Enrique Pena Nieto's speech during the plenary meeting of the Ibero-American Summit, in Panama City, capital of Panama, Oct. 19, 2013. (Xinhua/Mauricio Valenzuela)

Heads of States and Governments listen to Mexican President Enrique Pena Nieto's speech during the plenary meeting of the Ibero-American Summit, in Panama City, capital of Panama, Oct. 19, 2013. (Xinhua/Mauricio Valenzuela)

Heads of States and Governments listen to Mexican President Enrique Pena Nieto's speech during the plenary meeting of the Ibero-American Summit, in Panama City, capital of Panama, Oct. 19, 2013. (Xinhua/Mauricio Valenzuela)

Colombian President, Juan Manuel Santos (L), listens to Mexican President Enrique Pena Nieto's speech, during the plenary meeting of the XXIII Iberoamerican Summit, in Panama City, capital of Panama, on Oct. 19, 2013. The XXIII Iberoamerican Summit of Heads of State and Government takes place in Panama. (Xinhua/Mauricio Valenzuela)

Mexican President Enrique Pena Nieto (R) delivers a speech during the plenary meeting of the XXIII Iberoamerican Summit in Panama City, capital of Panama, on Oct. 19, 2013. (Xinhua/David de la Paz)

Spanish Prime Minister Mariano Rajoy (L) attends the plenary meeting of the XXIII Iberoamerican Summit, in Panama City, capital of Panama, on Oct. 19, 2013. (Xinhua/David de la Paz)

Heads of State and Government pose for group photos during the official photo of the XXIII Iberoamerican Summit, in Panama City, capital of Panama, on Oct. 19, 2013. (Xinhua/David de la Paz)

Heads of State and Government pose for group photos during the official photo of the XXIII Iberoamerican Summit, in Panama City, capital of Panama, on Oct. 19, 2013. (Xinhua/David de la Paz)

Mexico's President Enrique Pena Nieto (L) shakes hands with Costa Rica's President Laura Chinchilla Miranda during the official photo of the XXIII Iberoamerican Summit, in Panama City, capital of Panama, on Oct. 19, 2013. (Xinhua/David de la Paz)