Pope Francis has a way of making headlines, even when he isn't trying to. He got in the news on his way back from Latin-American trip, calling out anti-immigrant wall-building without bridge-building as un-Christian and leaving the door slightly ajar on contraception in light of the Zika virus.
On the first part, he was asked about The Donald's proposed Tortilla Curtain and he tried to sidestep the question and talk more in theory. After conceding that we're all political animals as Aristotle noted, he tacked the Wall-
And then, a person who thinks only about building walls, wherever they may be, and not building bridges, is not Christian. This is not in the gospel. As far as what you said about whether I would advise to vote or not to vote, I am not going to get involved in that. I say only that this man is not Christian if he has said things like that. We must see if he said things in that way and in this I give the benefit of the doubt.
At minimum, such wall-builders are being selfish and uncharitable, seeing the immigrants as an unlawful menace rather that people looking for a better life. True, there is a subset of the illegal immigrants that are worrisome, but casting the whole lot as a evil horde shows a lack of compassion. I think that's what Francis was after here.
Compassion isn't Donald Trump's strong suit, making a buck and making himself look good is. Judging ones ultimate salvation is above any mortal's pay grade, but calling BS on ungodly behavior is proper if done in a loving manner.
With a nativist-friendly and Catholic-unfriendly South Carolina voting this weekend, Trump likely would love a fight with Francis, since Francis is broadly seen in a negative light with ethnically-evangelical blue-collar folks for whom Catholic-bashing is a popular parlor game.
Jesus was a Jewish liberal on a lot of the issues of His day, being more egalitarian than your average first-century Holy Land-denizen. Peter's successor as the Bishop of Rome winds up reminding us of that, much to the discomfort of the more mercenary and ethnocentric among us.