"We cannot afford to allow ISIS [Daesh] to continue to enjoy safe havens [in Syria], to recruit. The perception of them doing well is a good recruiting tool for them…. So we must, it’s in our vital national security interest, we must destroy ISIS in Syria."
"We have to find the best way to accomplish that objective," Ryan stressed.
The US-led coalition of 68 nations has started to carry out airstrikes against Daesh in Syria and Iraq in 2014, with the strikes in Syria not being authorized by the government of President Bashar Assad or the UN Security Council.
In December 2016, Pentagon announced the United States would send additional 200 servicemen to Syria to participate in the operation to oust Daesh from its stronghold Raqqa, which the terrorists consider to be their capital.