WASHINGTON (AP) — The Department of Homeland Security has asked for 20,000 National Guard troops to assist with immigration roundups across the country, and the Pentagon is reviewing the unusual request, a U.S. official confirmed to The Associated Press.

The Department of Homeland Security (DHS) has formally asked for the deployment of 20,000 National Guard troops to support immigration roundups across the country, raising new questions about the federal government’s use of military resources for interior enforcement operations.

The Department of Homeland Security said Friday that it has requested the Pentagon provide thousands of National Guard troops to bolster efforts to remove undocumented migrants from the United States.