In the brief time that Trump has been in office, he has revoked the legal status of Venezuelans, Haitians, and now Ukrainians. If you add up the numbers from each of those links, that is over a million people who were "legal" who Trump is now making "illegal."1 While I am sure that some of those people losing protected status will leave the U.S., many, if not most, will probably try to stay. Meanwhile, the Trump Administration has deported about 18,000 people in the first month of his presidency.
One hallmark of both the original Trump Administration was that most of the administration's efforts are directed at people who are legally in the country, while calling them "illegal." This time he seems to be going even further, making moves to make more people "illegal." It's ironic because Trump and his supporters supposedly want to reduce the number of "illegals" in the country but all he is doing is making more. It's also a needless massive human tragedy. But that only registers with people who aren't bigoted monsters.
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1- Yeah I know that no human is illegal and the preferred term, at least for people in my circles, is "undocumented." But the problem is the Venezuelans, Haitians, and Ukrainians who had protected status have documents. The problem isn't that they didn't have the proper papers. They did. The President is just declaring that those papers are no longer proper. In this context "undocumented" doesn't seem to describe who they are.