Fox News contributor and investigative reporter Sara Carter joined "Hannity" Thursday in an exclusive report to discuss how sex trafficking operations have exploited migrant women at the U.S. southern border. "We're talking about children as young as eight years old, sold into prostitution. It's just horrific," Carter said. "Across the globe, more than 25 million people are subjected to human trafficking and slavery. In the United States, it's tens of thousands," she continued. "When you think about the number of people coming across the border and flooding into our cities, those that we don't even know … even those that...