Today, the United States Supreme Court denied a request from the Trump administration to expedite a decision on DACA. This keeps the Deferred Action for Childhood Arrivals program on life support for a few more months, but also keeps its 690,000 recipients in limbo: Do they stay or do they go? Congress still hasn’t been able to pass a vote on DACA. Vox’s Dara Lind and Matthew Yglesias say that’s because Trump has moved the conversation into unfamiliar territory: from illegal immigration to legal immigration.