An undercover investigator, who embedded himself in a Central American migrant caravan, has exposed the true agenda behind the mass migration, and a major cover-up by the liberal mainstream media. After covertly traveling with the caravans, the investigative filmmaker revealed what he found this week during an interview with Fox News's Tucker Carlson. Ami Horowitz traveled to the southern Mexican state of Oaxaca where he joined a caravan and moved with the migrants as they made their way north in the hope of entering the United States.