Had it not been for Pope Leo's walls--and other Christian walls, such as Constantinople's, which kept Islam out of Europe for centuries, and Vienna's, which stopped a full-blown jihad as recent as 1683--there might not be a pope today
Pope Francis Tears at History's Ancient Walls against Islam
FrontPage Magazine
Pope Francis continues to argue for two interrelated points that, while seemingly humane, compromise Western nations and expose their citizens to danger.
He reiterated his first point earlier this month when he said, "I appeal not to create walls but to build bridges." Francis has made this appeal frequently, both figuratively (when imploring Western nations not to close their doors against more incoming Muslim migrants) and literally (for instance by characterizing Donald Trump's proposal to build a U.S.-Mexico wall as "not Christian").