LIVE VIDEO ALERT: Obama to address nation on Libya

WASHINGTON (AP) - President Barack Obama is set to address the American people tonight to explain his decision to send U.S. forces to head the UN military mission in Libya.
The purpose of the mission is said to prevent Libyan leader Moammar Gadhafi from unleashing his military on his own people.
Obama's speech is set to air at 6:30 p.m. CT.  Watch it live on KFVS12 and's live news coverage from CBS News page.
Deputy National Security Advisor Denis McDonough says U.S. military involvement in Libya does not set a  precedent for how the U.S. will handle similar uprisings in other countries throughout the Middle East.
The administration judges each situation separately, McDonough says, and based on what is in the best interest of the U.S. He says there are no plans for the U.S. to intervene militarily in Syria, where security forces are cracking down on protesters.
McDonough spoke at the White House ahead of Obama's Monday night speech on his rationale for U.S. military involvement in Libya. Officials are reluctant to discuss details of Obama's speech, including whether Obama would lay out a timeline for ending U.S. military actions.
McDonough did say that Secretary of State Hillary Rodham Clinton would be discussing an exit strategy during a key international meeting in London Tuesday.

Copyright 2011 by The Associated Press. All Rights Reserved.