The main purpose of this legislation, known as the Oversight Access Act, is to ensure that Members of Congress and their staff can freely access facilities operated by the Department of Homeland Security (DHS) that are used to detain or house individuals, often referred to as aliens. The goal is to enhance oversight of these facilities, allowing Congress to monitor conditions and practices within them. Key provisions of the Act include a clear prohibition against the Secretary of Homeland Security from preventing Congressional access to these facilities.