MADRID — Pope Leo XIV has embarked on a weeklong visit to Spain at a politically convenient moment for Prime Minister Pedro Sánchez, whose scandal-hit government finds itself on the same side as the pontiff on some of the most contentious issues in global politics. Pope Leo has become one of the Catholic Church’s most outspoken advocates for migrants, calling on leaders to treat migrants “with dignity” while criticizing the U.S. government’s approach as “inhumane.” In contrast to many of his