13 / 24
Pope Francis waves next to the US border before celebrating mass at the Ciudad Juarez fairgrounds in Chihuahua state, Mexico on February 17, 2016. Throngs gathered at Mexico's border with the United States on Wednesday for a huge mass with Pope Francis highlighting the plight of migrants -- a hot-button issue on the US presidential campaign trail. AFP PHOTO/ Yuri CORTEZ / AFP / YURI CORTEZ