A recent FBI-led raid at an Idaho race track shows how immigration is driving federal law enforcement under the Trump administration. More than 200 officers from at least 14 agencies, including U.S. Immigrations and Customs Enforcement and Border Patrol, detained around 400 people. The Oct. 19 operation resulted in just four gambling-related arrests, while 105 people were arrested on suspicion of immigration violations. Local police also participated. Witnesses reported aggressive tactics, including zip-tying children. It's unclear which agency the officers who detained the children were from. The FBI initially said no aggressive tactics were used on children but later amended that statement to say “young children.”