Two US senators said Syria's air defence system isn't as strong as was once thought and add that recent air strikes show the regime is vulnerable.
Former Republican presidential candidate Senator John McCain and Democratic Senator Patrick Leahy said today that Syrian President Bashar al-Assad's air defence systems were not impenetrable.
In recent days reported air strikes launched by Israel targeted a shipment of advanced missiles believed to be headed for the Lebanese militant group Hezbollah.
Speaking on Fox News Sunday, McCain said Syria had crossed another "red line" in transferring weapons to US aggressors, but he does not believe US ground forces should go into Syria to secure the weapons.
Leahy spoke to NBC's "Meet the Press".