The Supreme Court announced Monday it will hear arguments this fall in a landmark immigration case that legal experts say could redefine the scope of executive authority in immigration enforcement. The case, Morrison v. Department of Homeland Security, centers on whether the executive branch can unilaterally expand deportation categories without explicit congressional authorization. A decision in the case, expected by June 2027, could affect millions of long-term visa holders and set new precedents for administrative power broadly. 'This is one of the most consequential immigration cases in a generation,' said constitutional scholar Professor Linda Marsh of Georgetown Law.