In United States v. Texas, the Supreme Court by an equally divided vote, 4 to 4, affirmed the decision of the U.S. Fifth Circuit Court of Appeals that the State of Texas had Article III standing to challenge in federal court the Department of Homeland Security’s (DHS) directive establishing a Deferred Action for Parents of Americans and Lawful Permanent Residents (“DAPA”) program to grant lawful immigration status to millions of undocumented immigrants. A serious question is whether state standing in this case will open the floodgates to allow states to challenge virtually every federal executive action. On the other hand, state challenges are arguably appropriate in a federalist system to oppose overreach by an expansive national governmen...