It’s hard to keep up with, much less unravel, the many legal cases aimed at reining in Donald Trump ’s assertions of virtually unlimited presidential power. But there’s one case pending at the U.S. Supreme Court right now that Georgetown University law professor Steve Vladeck calls a “make-or-break moment” for the Court. It’s an emergency petition by the Trump administration to set aside lower-court determinations that the president had failed to make an adequate factual argument that protests against ICE tactics in and around Chicago justified deployment of federalized National Guard units from Illinois and from Texas.

The most recent ruling , by a three-judge panel of the Seventh Circuit court of appeals (including one Trump and another Republican nominee), put the matter very blu

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