Sending migrants to El Salvador’s CECOT prison raises grave constitutional concerns under the Fifth and Sixth Amendments.

"Khalil’s case involves an assertion of government power over lawful permanent residents far beyond what we have seen in decades, if ever."

"In their apparent effort to give credence to the Trump Executive Order, Professors Barnett and Wurman indefensibly ignore these core, constitutive principles."

How far can the federal government go to force local and state governments to help enforce federal law? Sooner rather than later, the Supreme Court will almost certainly have to answer that question.

A leading expert analyzes the Justice Department threat to prosecute state and local officials in sanctuary cities.