Francis brought back a dozen Muslim Syrian refugees with him when he went to Greece, while Trump has tried to impose a travel ban on people from a half-dozen mostly Muslim nations. U.S. bishops have praised the Trump administration for its abortion stance, but oppose Republican health care reform plans because of the impact on the poor. Trump, who campaigned on his plans to build a wall on the border with Mexico, shot back saying it was "disgraceful" for a religious leader to question someone's faith. [...] Francis has urged the U.S. and North Korea to step away from the brink and use negotiations and diplomacy to defuse tensions on the Korean peninsula. [...] he wrote an entire encyclical about the environment, and the moral imperative to save God's creation, denouncing how the wealthy had destroyed the planet at the expense of the poor.