In the documents that make up our American system of government, there are fairly clear assignments of duties. This assignment has become a grey area in the current decade of mass and instantaneous communication.
There are many, many laws on the books right now. Not the least of which are laws that are intended to govern where our boundaries are and who is at liberty to pass across them. Without delineation of where the boundaries are there is no nation. There is no sovereign soil to protect, defend, or keep the peace in.