US leaders question what kind of leadership will rise in Syria after Assad regime collapses

U.S. officials and analysts are trying to figure out exactly what type of government is going to be taking over Syria. the rebels that have been fighting against former President Bashar Assad have also been linked to terror groups. white House National Security Advisor Jake Sullivan says the U.S. would take action if ISIS tries to take power in Syria. Michael O?Hanlon of the Brookings Institution tells FOX 5?s On The Hill that rebel leaders have signaled they would not form an Islamic state but questions remain.