CHICAGO — The Border Patrol agent who broke norms leading an immigration crackdown in Los Angeles reached Chicago on Tuesday, potentially signaling a new, more aggressive phase to an enforcement surge announced last week in the nation's third-largest city.

"Well, Chicago, we've arrived!" Gregory Bovino said in a social media post that included a stylized video of Customs and Border Protection vehicles and immigration agents in the city. "Operation At Large is here to continue the mission we started in Los Angeles." Homeland Security Secretary Kristi Noem was also in Chicago, saying Department of Homeland Security officers made multiple arrests early Tuesday.

For weeks, President Donald Trump promised the city would see a surge in immigration enforcement and National Guard troops over the

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