All immigration, legal and illegal, should be halted immediately until such time as we (our government) can get a handle on the situation and control it so it is orderly, legal, and protects the security of the United States. No need to hold one's breath. Not very likely to happen.
So, if we are compelled by our Muslim sympathizing president to accept thousands of so-called Syrian refugees then we (the government) should militarize all those young (18-32 years) male Syrians, or whoever they are, refugees that want to come here. Since they are compelled to come here then conscript (draft) them into a U.S. Army special unit (preferably in an off-shore location) for a minimum of three years. (Conscription of foreigners into the army is not new. My WW II training platoon had two foreigners drafted into the army.) Train them like Special Forces troops. If they can't "hack" it then ship them back to the Middle East. Those that "hack" it get to stay here providing they take a pledge of allegiance to the United States, the Constitution, and commit to a minimum of six years enlistment in the U.S. Army Reserves so authorities can keep track of them. At the end of that period if they meet all other qualifications then they can then apply for citizenship, otherwise ship them back home wherever that is. And, if we have to put "boots-on-the-ground" to fight in Syria or any other place in that part of the world, then let it be them that fight to free their country from tyranny.
We simply can not allow the United States to be invaded by all manner of misfits from around the world, especially those that seek to kill us and "fundamentally transform" our nation into something else. Our form of government has served us well for over two hundred years. No need to substitute something else in it's place. There is a process for peaceful and legal change when needed.