President Donald Trump's border czar told reporters Thursday that federal authorities planned to increase immigration raids in Los Angeles and other so-called "sanctuary cities," with Chicago likely the next target. "You're going to see a ramp up of operations in New York; you're going to see a ramp up of operations continue in L.A., Portland, Seattle, all these sanctuary cities that refuse to work with ICE," Tom Homan said. Since June, Southern California has been ground zero of thousands of immigration arrests as well as legal battles over whether the raids violate the U.S. Constitution.