A district court has issued an order stopping the muslim ban as it relates to the issuance of visas and travel to the United States. Other secitions of the Executive Order that were not challenged remain in effect. As of February 4, 2017, the Department of State has indicated that it will reinstate visas that have been revoked and airlines will allow people from the seven listed countries to board flights to the United States.
From the Department of Homeland Security (DHS):
In accordance with the judge's ruling, DHS has suspended any and all actions implementing the affected sections of the Executive Order entitled, "Protecting the Nation from Foreign Terrorist Entry into the United States."
This includes actions to suspend passenger system rules that flag travelers for operational action subject to the Executive Order.
DHS personnel will resume inspection of travelers in accordance with standard policy and procedure.
At the earliest possible time, the Department of Justice intends to file an emergency stay of this order and defend the President's Executive Order, which is lawful and appropriate. The Order is intended to protect the homeland and the American people, and the President has no higher duty and responsibility than to do so.
For the latest information, please visit the DHS website: https://www.dhs.gov/news