Pope Francis said on Saturday that problems of migration would never be resolved by physical barriers but instead required social justice and correcting the world’s economic imbalances. Francis, starting a two-day visit to Morocco, also backed Moroccan King Mohammed VI’s efforts to spread a moderate form of Islam that promotes inter-religious dialogue and rejects any form of terrorism or violence in God’s name. In recent months, migration has again risen to the fore of national political debates in a number of North African and European countries and the United States. US President Donald Trump, has vowed to fulfil his campaign pledge to build a wall along the border with Mexico and on Friday threatened to close the border next week if Mexico did not stop immigrants reaching the United States. “The issue of migration will never be resolved by raising barriers, fomenting fear of others or denying assistance to those who legitimately aspire to a better life for themselves and their families,” Francis said at the welcoming ceremony. “We know too that the consolidation of true peace comes through the pursuit of social justice, which is indispensable for correcting the economic imbalances and political unrest that have always had a major role in generating conflicts and threatening the whole of humanity,” he said. Morocco has become a key departure point for African migrants trying to reach Europe after crackdowns that closed or limited routes elsewhere. Italy’s anti-immigrant interior minister has closed ports to rescue ships run by charity groups. Francis, who has made defence of migrants and refugees a key part of his preaching, said he was concerned about their “frequently grim fate” and receiving countries must acknowledge that migrants are forced to leave their homes because of poverty and political upheaval. From the airport to the city centre, Francis, 82, was driven in a white popemobile on a drizzly day as the 55-year-old king rode beside him standing in a separate vehicle, a vintage black 1969 open-top Mercedes 600 Pullman. At one point, a man rushed towards the king’s car but was stopped and detained by guards as the motorcade continued along the street lined with bystanders. Police said he was a 17-year-old Moroccan who wanted to seek help from the king for his sick parents.