ZENIT asked J. Kevin Appleby, the senior international migration policy director of the Center for Migration Studies of New York, a member of the Scalabrinian International Migration Network (SIMN), to give an overview of the issue in light of the Pope’s visit and Church teaching. Pope Francis will soon visit Mexico and will visit the U.S.-Mexican border in Ciudad Juarez, across from El Paso, Texas.   What will the Holy Father do at the border?  What