President Obama Proposes $500 Million To Aid Syrian Rebels

The White House sent Congress a $500 million request Thursday for a Pentagon-run program that would significantly expand previous covert efforts to arm rebels fighting both the Sunni extremists and forces loyal to Syrian President Bashar Assad.

If approved by lawmakers, the program would in effect open a second front in the fight against militants spilling over Syria's border and threatening to overwhelm neighboring Iraq.

President Obama has long been reluctant to arm the Syrian opposition, in part because of concerns that weapons may fall into extremist hands. But administration officials say the U.S. has grown increasingly confident in recent months about its ability to distinguish the moderate rebels from the more extremist elements that include the al-Qaida-inspired Islamic State of Iraq and the Levant, which has stormed into Iraq and captured much of the northern part of the country.

Jennifer Griffin has more tonight on Special Report