Dueling legal interpretations of what constitutes “regular forces” are at the heart of briefings now positioned before the U.S. Supreme Court as the high court prepares to rule on President Donald Trump’s authority to deploy National Guard troops to Illinois.

While considering a motion to stay a lower court’s order blocking the deployment, the Supreme Court last month asked both sides — the Trump administration and the state of Illinois — to submit supplemental briefs dealing with a provision in federal law that Trump says allows him to dispatch National Guard troops in cases where there is an invasion, a rebellion or a time and when the president “is unable with the regular forces to execute the laws of the United States.”

The key issue the high court sought briefings on was wheth

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