The United States of America is not a Court Dictatorship in which the other branches of government merely get to make suggestions.
The Constitution grants the chief executive the power to enforce the laws of the land. In addition to being commander in chief, and executive of all cabinet officers and of their departments, the POTUS is fully empowered by US law to make all decisions regarding enforcement of immigration laws. Congress itself wrote those laws.
The current argument against the President’s temporary travel restriction is that the President spoke words that could be seen as unaccepting toward all muslims. Therefore, because his heart isn’t in the right place, he isn’t qualified to conduct his constitutional duties.
That’s good to know. I don’t like the IRS. That should disqualify me from sending them my money.