Why it matters: The largest number of single-day arrests announced by Immigration and Customs Enforcement since Trump took office last Monday and declared a national emergency on the U.S.-Mexico border is a clear sign that his administration is stepping up efforts crack down on undocumented immigrants.

Top Trump administration officials visited Chicago on Sunday to witness the start of ramped-up immigration enforcement in the nation’s third-largest city as federal agencies touted arrests around the country.

A spokesperson for Immigration and Customs Enforcement said a range of federal agencies conducted "enhanced targeted operations" in Chicago on Sunday "to enforce U.S. immigration law and preserve public safety.