During a presser on the papal plane, Pope Francis skewered Donald Trump as being "not Christian" because of his promises to build a wall on the U.S.'s border with Mexico.
"A person who thinks only about building walls, wherever they may be, and not of building bridges, is not Christian," the pope said.
Trump has already returned fire, saying the pope would "wish" and "pray" he is president if the Vatican is attacked by ISIS. Trump also said Pope Francis "doesn't know me," and suggested he had been corrupted by Mexican government officials. Read Trump's full statement below. Jeva Lange