Pope Francis on Saturday condemned the political use of fear and the building of walls, describing the refugee crisis as “a problem of the world” and urging political leaders to do more, according to America magazine.The pope did not name names and did not refer to the upcoming U.S. presidential election, but he spoke about issues that have come up in the 2016 campaigns, including immigration and refugees. The speech, given in Spanish, included a quote from the Rev. Martin Luther King Jr.“No tyranny can be sustained without exploiting our fears,” the pope said, according to comments published by the Vatican Radio. “Citizens are walled-up, terrified, on one side; on the other side, even more terrified, are the excluded and banished.”Fear “is fed and manipulated,” Pope Francis said. “Because fear – as well as being a good deal for the merchants of arms and death – weakens and destabilizes us, destroys our psychological and spiritual defenses, numbs us to the suffering of others, and in the end it makes us cruel.”Pope Francis gave his remarks Saturday evening during a meeting at the Vatican with participants in the World Meeting of Popular Movements, a collection of grass-roots organizations that include the poor and the unemployed. The pope urged the defeat of “false prophets who exploit fear and desperation, who sell magic formulas of hatred and cruelty or selfish well-being and illusory security,” according to comments published by Catholic News Service.