The Supreme Court will sit for a special session May 15 to hear a challenge to President Donald Trump's birthright citizenship order.

The merits, however, are not before justices at this time. Instead, the court will consider the scope of relief temporarily available to the parties, and in particular whether federal district courts can enjoin a policy nationwide as to all persons affected.

Joining Cases and Controversies hosts Kimberly Robinson and Greg Stohr is University of Virginia law professor Amanda Frost, a leading expert on both birthright citizenship and so-called nationwide injunctions.

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