OK so he really didn't. The Pope today decided to speak up in a way that no one could rationally misunderstand engaging in a bit of American politics. While in Mexico the Pope stated that "A person who thinks only about building walls, wherever they may be, and not building bridges, is not Christian," Pope Francis said. "This is not in the Gospel."
Mr. Trump of course didn't let it go. He reacted “For a religious leader to question a person’s faith is disgraceful,”
Trump said in a statement. “I am proud to be a Christian and, as
president, I will not allow Christianity to be consistently attacked and
weakened, unlike what is happening now, with our current president.”
The entire notion of a Pope living in a walled city state criticizing an American politician calling for border protection was not lost on those with functioning brains. It is also appropriately ironic that the Leonine Wall around the Vatican City was built 11 centuries ago in response to Islamic attackers assaulting St. Peter's Basilica.