By Andrew Chung

(Reuters) -The U.S. Supreme Court signaled on Wednesday that it is actively debating how to interpret the wording of a law that limits when a president can use members of the National Guard in a challenge to President Donald Trump’s bid to dispatch troops to the Chicago area.

The justices ordered the challengers – the state of Illinois and the City of Chicago – as well as Trump’s Justice Department, to file written briefs by November 10 answering the question of what the words “regular forces” in the law means.

The law at issue lets a president deploy state National Guard troops to suppress a rebellion or if he is “unable with the regular forces to execute the laws of the United States.”

The Justice Department asked the court in an emergency filing on October 17 to lift

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