Whether you like it or not, it has indeed been happening for a long time, and under multiple administrations from either party. If you're interested in the tragedy of it all enough to care, then go look these cases up instead of first accusing someone of lying because they might be smearing a politician that you preferred, and who isn't the current orangutan in the White House.
Trump's administration is notably and vocally hostile to illegal immigrants, to migrants and I suspect to immigrants in general, but it's mainly still using the tools and practices that have long since been refined by multiple federal agencies whenever opportunities for heavy-handedness presented themselves.
Because it's Trump's administration, and enough of the major media system is unsupportive of him (still, for now), the matter is gaining more attention. This attention is a good thing, but it shouldn't cloud one from considering the possibility that the bureaucratic defects and authoritarian inertia of federal policing exist beyond the confines of a single type of administration.