The answer to questions like this are simple if you think about them for a minute. As I stated in my other post,along with having the same rights as US citizens have while they are here,they also have the same obligations. One of these obligations (and a BIGGIE!) is that they obey our laws. What the INS is SUPPOSED to be doing is making raids to arrest and deport people here ILLEGALLY. If they are here illegally,they are not obeying our laws by definition,and they do NOT have a right to be here.
Notice how the INS can't deport somebody who is here legally?
But given the Constitution, you can't get there, as if they had the full rights, the law could not be made.