People on the Mexican side of the international border worship while Cardinal Sean O'Malley leads mass, Tuesday, April 1, 2014, in Nogales, Ariz. A delegation of Roman Catholic leaders celebrated Mass along the U.S.-Mexico border to raise awareness about immigration and to pray for policy changes. (AP Photo/Matt York)

People on the Mexican side of the international border worship while Cardinal Sean O'Malley leads mass, Tuesday, April 1, 2014, in Nogales, Ariz. A delegation of Roman Catholic leaders celebrated Mass along the U.S.-Mexico border to raise awareness about immigration and to pray for policy changes. (AP Photo/Matt York)