These actions are within the President's authority and responsibility under the Constitution and laws; and these actions are vital to our security. This is a wartime measure, limited in scope to surveillance associated with terrorists, and conducted in a way that safeguards the civil liberties of our people. It is important to note that leaders of Congress have been briefed more than a dozen times on the President's authorization, and on the activities conducted under it. I've personally presided over most of those briefings. In addition, the entire program undergoes a thorough review within the executive branch every 45 days. After each review, the President determines once again whether or not to reauthorize the program. He has done so more than 30 times since September 11th -- and he has indicated his intent to do so as long as our nation faces a continuing threat from al Qaeda and related organizations.