Now there's more evidence: Top Trump official warns special immigration status may end soon for a million people, by Franco Ordonez, Miami Herald, July 12 2017:
WASHINGTON—President Donald Trump's top immigration official warned Hispanic members of Congress Wednesday that over a million people living in the United States under a special protected status could soon be placed in line for deportation.General Kelly confirmed VDARE.com's impression that he's a problem, but he also confirmed our view of what's happening:Homeland Security Secretary John Kelly told members of the Congressional Hispanic Caucus that the fate of deferred action program known as DACA — Deferred Action for Childhood Arrivals — will likely be determined by the courts, perhaps as soon as September, and that attorneys he’s consulted with do not think the program is legally sustainable. [Emphases added]
Kelly said he personally supports the DACA program and would not rescind the program, but that he didn’t expect the administration to defend it in a court challenge
It's not heroic, but it will work.