So, exactly who is being asked to "show their papers" and what exactly are the circumstances?
Again, I hear a lot of hyperbole around this point but I've seen exactly zero evidence of this actually occurring. Every incident I've seen cited was a targeted apprehension or of someone that has directly interfered in a situation. As I said before, if someone has evidence to the contrary, please share.
Now, as to whether an administrative warrant is sufficient or a signed judge's warrant is required, that's a different question. I'm no legal scholar, so I have no idea, but I'm sure courts will be asked to weigh-in soon enough. Each side will bring arguments to their favorite judge and claim validation. There does some to be nuance here in that the cases have already gone through that previous due diligence and agents are executing final deportation orders.
It is slippery slope though. As
@Ooh-Rah said earlier, will it be used to further trample on 2A?