Senate vs. Ermita , GR 169777, April 20, 2006 FACTS: This is a petition for certiorari and prohibition proffer that the President has abused power by issuing E.O. 464 “Ensuring Observance of the Principles of Separation of Powers, Adherence to the Rule on Executive Privilege and Respect for the Rights of Public Officials Appearing in Legislative Inquiries in Aid of Legislation Under the Constitution, and for Other Purposes”. Petitioners pray for its declaration as null and void for being unconstitutional. In the exercise of its legislative power, the Senate of the Philippines, through its various Senate Committees, conducts inquiries or investigations in aid of legislation which call for, inter alia, the attendance of officials and employees of the executive department, bureaus, and offices including those employed in Government Owned and Controlled Corporations, the Armed Forces of the Philippines (AFP), and the Philippine National Police (PNP). The Committee of the Senate issued inv...