WASHINGTON — President Donald Trump has been able to depend on the U.S. Supreme Court’s conservative majority to uphold his unprecedented broad use of executive power. But when it comes to sending the National Guard into Illinois , there are signs a Trump victory might not be a slam dunk.

Unlike in many of the administration’s other high-profile legal battles, the high court has moved cautiously on the Illinois dispute. The justices have given lawyers until Monday — two weeks after issuing their October order — to file additional briefs, a sharp contrast to the three-day turnaround the court allowed when the case first landed on its docket.

The Trump administration is asking the court to overturn lower court decisions that effectively sidelined National Guard troops from Illinois,

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