Watch | Pope says Trump is not Christian, the Republican fights back

Pope Francis was on a flight home from Mexico when he suggested that Donald Trump is “not Christian” if he intends to build a wall along the US-Mexican border. Trump immediately fired back, saying it is disgraceful for a religious leader to question a person's faith. Here's exactly what was said.Trump, a leading U.S. Republican presidential candidate, has said that if elected, he will build a wall along the Mexican border from Texas to California and expel 11 million people who are in the country illegally.Pope vs