Well I mean the article says that they're not even going to wait until the "deadline" for so-called self-deportation before they start arresting people who came in under the immigration program:

"But DHS said it retains the authority to target migrants who arrived under this program before the 30-day period lapses. Officials say those prioritized for arrest will include migrants who have failed to apply for another immigration benefit like asylum or a green card."

So they've overnight given themselves the right to arrest people who the day before had a legal right to live in the US. Basically they seem to think the only legal and human rights that exist are those granted by their god-king or Muskolini, and they don't fear the legacy judicial system.