DHS said that while Congress members have the right to make unannounced visits to detention facilities for oversight, ICE field offices “fall outside” that purview.

The policy says that ICE field offices are not subject to a federal law that allows members of Congress to make unannounced oversight visits to immigration facilities that “detain or otherwise house aliens.

The Department of Homeland Security is now asking members of Congress for at least 72 hours' notice before visiting an ICE detention center.