Republican presidential front-runner Donald Trump's new television ad shows footage of dozens of people crossing a fence as the narrator mentions the U.S.'s "southern border" with Mexico. The footage, however, is actually of Moroccans crossing the border into Melilla, one of two enclaves on the Moroccan coast held by Spain, according to Politifact The narrator says the billionaire will "stop illegal immigration by building a wall on our southern border that Mexico will pay for," as the footage plays. Politifact traced the images to an Italian television network, Repubblica TV, which posted the video on May 3, 2014. About 800...