The Department of Homeland Security sent a memo to the Department of War, requesting 100 military personnel to be sent to Illinois "claiming a need for protection of ICE personnel and facilities," Gov. J.B. Pritzker announced Monday.

The governor held a news conference after Border Patrol agents, some of whom were carrying rifles and wearing bulletproof vests, began patrolling prominent streets in downtown Chicago over the weekend .

"What I have been warning of is now being realized," Pritzker said at a news briefing.

It remained unclear how many arrests had been made as of Monday afternoon; NBC Chicago reached out to Border Patrol for information on Sunday, but hadn't received a response as of Monday morning.

Hundreds of people in the city and suburbs have been arrested by Immigrati

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