President Donald Trump's administration apparently believes the Alien Enemies Act of 1798 can be used to address unlawful migration — but so far, federal courts have pushed back on that notion.

Photo: Migrants who illegally crossed into the United States await processing by U.S. Border Patrol agents outside of San ...

In a flurry of rulings this week, the high court allowed the administration to proceed with mass firings but maintained legal guardrails on deportations.