These are unprecedented times where green card status and even citizenship can be taken away. I think that all that one can do is to know one's rights and have

These are unprecedented times where green card status and even citizenship can be taken away. I think that all that one can do is to know one's rights and have the name and number of a lawyer handy who can be contacted in the event the worst happens. The ACLU has some very clear guidance regarding the rights of U.S. citizens and non-U.S. citizens when questioned or detained by ICE (or another immigration agency).