Pope Leo on Saturday visited Italy’s Lampedusa island, a major port of call for migrants risking the perilous crossing from Africa, in a stark message to US and EU leaders. The Catholic Church’s first US pope, who has clashed with the administration of President Donald Trump over its treatment of migrants, is marking July 4, the United States’ 250th anniversary of independence, on a migration frontline. Leo’s visit also comes just two weeks after the European Union’s approval of new migrant...