Argentina's President Cristina Fernandez, Mexico's President Felipe Calderon, center, and Mexico's first lady Margarita Zavala pose for photos at a welcome ceremony at the official Los Pinos ... more 
Argentina's President Cristina Fernandez, Mexico's President Felipe Calderon, center, and Mexico's first lady Margarita Zavala pose for photos at a welcome ceremony at the official Los Pinos presidential residence in Mexico City, Monday May 30, 2011. Fernandez, who arrived Sunday, is in Mexico City for a two-day visit. less 
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Associated Press | Photo By Miguel Tovar
Mon, May 30, 2011 1:08 PM EDT