If legal rights are created by political power, then they can be taken away by political power. So, they are within the category of political power. And, is something really a right if the government can legitimately create it or take it away? I would say no. You destroy (or at least greatly diminish) the meaning of the word "right" by applying it to the use of political power.
No human rights or natural rights or moral rights are violated by deporting illegal aliens. Human rights were violated by Hitler. So, his analogy fails. Your introduction of the concept of "legal rights" does not change this analysis. It is already clear that illegal aliens have no legal right to stay here. Even Conor wasn't making that argument. Conor was arguing a moral right, which is misleading at best.