President Donald Trump’s novel use of National Guard troops for law enforcement purposes has reopened a debate over states’ authority to control police powers, as dueling briefs from current and former state leaders filed in Illinois’ lawsuit against the president show.

A bipartisan group of former governors said Trump’s federalization and deployment of National Guard members to Chicago to control “modest” protests upended the careful balance between state and federal powers.

At the same time, a group of 17 current Republican attorneys general told the court they supported the administration’s move that they said was necessary to protect immigration enforcement officers.

Both groups submitted friend-of-the-court briefs in the suit in the U.S. District Court for the Northern District of

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