I don't like Muslims but from the point of view of justice, I understand that the decrees which publishes Trump really have nothing to do with the law. Therefore, their courts and overturned.
What Trump did was entirely lawful. However, the judge found some minor loopholes and used them to suspend the order. This happens every now and then. But don't rejoice too much. He is preparing another executive order, this time without any loopholes.