There is definitely a trend among US progressives to use "undocumented" instead of "illegal," even as an adjective, to avoid the connotation of illegal people.

There is definitely a trend among US progressives to use "undocumented" instead of "illegal," even as an adjective, to avoid the connotation of illegal people. I tend to follow that personally (even though in many cases it's not technically accurate—"undocumented" folks often have regular checkins with ICE if there's no deportation order yet, while proceedings are in progress, and that process certainly generates a lot of documentation, and there's also programs like DACA) but I won't fault someone for using the official terminology in good faith.