The point is that the executive is constrained within the laws passed by Congress, and there is a law (https://en.wikipedia.org/wiki/Immigration_and_Nationality

The point is that the executive is constrained within the laws passed by Congress, and there is a law (https://en.wikipedia.org/wiki/Immigration_and_Nationality_Act_of_1965 https://en.wikipedia.org/wiki/Immigration_and_Nationality_Ac...) that clearly makes this not ok to do. If the supreme court starts upholding executive orders over standing law, I'd be terrified.