Immigration and Customs Enforcement agents will reportedly begin a massive operation this Sunday to roundup 2,000 families facing deportation.

ICE will likely begin the plan, known within the agency as the “family op,” with pre-dawn raids in major U.S. cities, according to the Washington Post. The raids will target migrant families that have deportation orders in as many as 10 cities including Miami, Los Angeles, Houston, Chicago, and other major immigration hubs.

The operation is expected to unfold over several days beginning Sunday morning, although discussions over the scale of the operation is still ongoing. Acting Homeland Security Secretary Kevin McAleenan has been reportedly advocating for a narrower operation that would look to detain about 150 migrant families that were provided attorneys but absconded.

Trump is firmly determined to move forward with the operation, and alluded to a mass roundup in a tweet last week that claimed, “ICE will begin the process of removing the millions of illegal aliens who have illicitly found their way into the United States.”

“They will be removed as fast as they come in,” he added.

