If you are or know anyone who is at an airport:
DO NOT GIVE UP YOUR GREENCARD OR OTHER PAPERS! YOU WILL NOT HAVE THE RIGHT TO DEMAND THEM BACK.
DO NOT SIGN FORM I-407! YOU WOULD BE WILLINGLY ABANDONING YOUR PERMANENT RESIDENCY STATUS.
TRUST NO IMMIGRATION OFFICER OR ENFORCER.
ACLU HAS SENT OUT LAWYERS. MAKE SURE YOU GET ONE.
Please protect yourself.
EDIT: Also, if you’re a green card resident who is a citizen of or from IRAN, IRAQ, LIBYA, SOMALIA, SUDAN, SYRIA, OR YEMEN:
Please make sure you DO NOT LEAVE THE UNITED STATES UNDER ANY CIRCUMSTANCES. YOU WILL NOT BE PERMITTED TO RE-ENTER THE COUNTRY.