From this morning's WSJ:

WASHINGTON—The Supreme Court on Thursday rejected the Trump administration’s decision to cancel a program that provided legal protections and work authorizations to undocumented immigrants who came to the U.S. as children.

The court, in a 5-4 opinion by Chief Justice John Roberts, said the administration acted arbitrarily when it moved to end the Deferred Action for Childhood Arrivals program, failing to offer an adequate explanation for doing so.

The ruling hands President Trump one of the biggest legal defeats of his presidency, and in the middle of an election year in which immigration is again a top political topic. The decision effectively provides relief to more than 600,000 DACA recipients, often referred to as Dreamers, who have been in limbo since Mr. Trump in 2017 decided to wind down the program.

The court said the Trump administration didn’t follow the legal requirements for transparency and accountability in making federal policy.