Note: I sent the following letter to President Obama on Monday. Dear President Obama, I write with great concern over your decision to use military force in Libya. My first and most urgent concern is with the legality of your decision. The text of the Constitution is very clear that Congress, not the President, has the authority to declare war. While no reasonable person questions the President's authority as commander-in-chief to initiate military action in the event of a national security emergency, this is by no means a national security emergency. While Muammar Gaddafi is a mass murderer, terrorist and war criminal, his regime represents no imminent threat to our national security.