I'm all in favor of arresting and deporting illegal aliens. However, this has to be done within the context of the constitution and laws of the United States. If those principles are disregarded or wilfully ignored in the process of enforcing the law, then the law itself is brought into disrepute. That's why the federal oath of law enforcement office (an oath I myself have sworn) is so specific about upholding the constitution.
This is highlighted by the alleged conduct of a group of Customs and Border Patrol agents at J. F. Kennedy airport in New York recently.
Passengers of a domestic Delta flight from San Francisco to New York were told to show their identity documents to uniformed agents of the Customs and Border Protection agency upon their arrival at John F. Kennedy airport on Wednesday evening.
CBP officers are border agents, whose statutory authority is generally limited to international arrivals.
CBP agents inspected passenger identifications on the jetbridge by the door of the aircraft. A CBP spokesman insisted to Rolling Stone that this action is "nothing new" and that there is "no new policy." But the unusual – and legally questionable – search of domestic travelers comes days after the Department of Homeland Security outlined its plans to implement President Trump's sweeping executive order targeting millions of "removable aliens" for deportation.
. . .
19 C.F.R. 162.6 ... states, "All persons, baggage and merchandise arriving in the Customs territory of the United States from places outside thereof are liable to inspection by a CBP officer." The CBP document adds: "CBP has the authority to collect passenger name record information on all travelers entering or leaving the United States."
Asked to clarify CBP's authority over domestic passengers, the spokesman replied that "at this time this is all I have."
There's more at the link.
We need to be very, very cautious of law enforcement overreach in such situations. I would absolutely refuse to show my ID to agents or officers who have no legal authority whatsoever to demand to see it. It's not that I disrespect them; rather, I respect the law more than I do those seeking to misapply it.
There's an old but true saying:
Every time we allow law enforcement overreach, we let our rights atrophy. Let's not go there.