CHICAGO - A federal judge will rule on the legality of President Donald Trump’s deployment of National Guard troops in Illinois on Thursday.

What we know:

U.S. District Judge April Perry will hear arguments over a request to block the deployment of Illinois and Texas Guard members.

The state of Illinois and the City of Chicago filed a lawsuit Monday alleging that Trump's authorization to deploy troops to the Windy City is "unlawful and dangerous."

Barricades surrounded the Dirksen Federal Courthouse downtown ahead of the hearing, where state and city officials are asking the court to declare the deployment unlawful.

The 69-page complaint argues that the president exceeded his constitutional authority by using the military in domestic affairs and that Americans "should not live und

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