Which office is responsible for overseeing investigative matters in the USCIS?

The Office of Inspector General is tasked with overseeing investigative matters within USCIS. This office is responsible for conducting audits, investigations, and evaluations of USCIS programs and operations to ensure efficiency, integrity, and adherence to legal and regulatory standards. By carrying out these responsibilities, the Office of Inspector General helps to identify issues, recommend improvements, and enhance transparency within the agency.

Other options do not serve the oversight or investigative functions. The Office of Legislative Affairs primarily focuses on managing communication and collaboration between USCIS and Congress, ensuring that legislative interests are represented. The Office of Public Engagement, on the other hand, is designed to facilitate outreach, communication, and the sharing of information between USCIS and the public or stakeholder communities. Lastly, the term "Order to Show Cause" refers to a legal document in immigration proceedings and is not an office within USCIS. Thus, the responsibilities and focus of the Office of Inspector General distinctly position it as the correct choice for overseeing investigative matters.