While Washington obsesses over a new book on White House intrigue, the Trump administration is reaching a critical point on the issue of immigration, one of the president’s top priorities and the subject of his most often-repeated campaign promises.

There are multiple moving parts: The Deferred Action for Childhood Arrivals program, a border wall, chain migration, the visa lottery, and — hanging over it all — funding the government. But everything hinges on DACA, unilaterally imposed by Barack Obama to temporarily legalize nearly 800,000 people who were brought to the U.S. illegally when they were young.