If you are a green card holder (lawful permanent resident) outside of the U.S. please reach out to an immigration attorney before you travel back to the U.S.
If you do plan to travel back to the US, you should fill out a USCIS G-28 form first that officially appoints an attorney to represent you in immigration situations and have that completed form with you as you board your flight.
The refugee program is being halted immediately, for at least 120 days. This will mean that anyone, anywhere in the process, will not move forward. The effort to resettle Syrian refugees in the U.S. is being halted indefinitely.
If you are non-citizen, even green card holder (lawful permanent residents), from one of the seven countries named, and you are ALREADY INSIDE the U.S., plan to DELAY all international travel for at least 90 days.
IF YOU LEAVE YOU ARE LIKELY TO BE DENIED RE-ENTRY.
There are rumors of ther nations being added such as Pakistan, Egypt, and Lebanon soon but these are not substantiated. Nevertheless it is prudent to delay travel if you suspect your country of nationality is at risk of being added.
If you are a non-citizen from one of the seven countries named, and you are OUTSIDE of the U.S., you will face issues at the airport upon attempting to re-enter the US.
IF YOU ARE ASKED TO SIGN AN I-407 AT THE AIRPORT OR BORDER DO NOT SIGN IT, ASK FOR THE SUPERVISOR WHO HANDLES LPR ADMISSIONS. If you sign it, you will be giving up your Green Card.
Non-citizens must answer questions asked by border agents. Give brief answers and never lie. You may also be asked to provide your social media information and phone. It is not clear whether this is prohibited for non-citizens; therefore you should comply or risk being turned away at the border.
Citizens must identify themselves to a border agent; therefore basic questions on where they live and their name are valid questions that should be answered in primary screening. If you are subjected to a secondary screening you can refuse to answer further questions. Citizens have a right of re-entry and you can assert that right. You and your property may be searched. If a border agent asks you for passcodes or passwords for your devices you do not need to provide them. If the agent asks for your social media account information you do not need to provide it and should not provide it.
Please keep looking for updates in the coming days to assess your travel options. If you are facing an emergency at the airport or are returning to the US in the coming days, please have our numbers on hand (CAIR Michigan 248-559-2247, CAIR National: 202.488.8787)
Whether you are a citizen or not, do not permit law enforcement to enter your home without a warrant. Even if they have a warrant, you should consult with an attorney before speaking to them. Get copies of business cards of all law enforcement officials. [Edit: IF YOU CAN. This is not an option for many]