Carl Higbie, a spokesman for a pro–Donald Trump super PAC, insisted to Fox News’ Megyn Kelly on Wednesday that a government registry for immigrants from Muslim countries “is legal” and would “hold constitutional muster.”

“I know the ACLU is going to challenge it, but I think it’ll pass,” Higbie said. “And we’ve done it with Iran back awhile ago, we did during World War II with [the] Japanese, which, call it what you will, may be wrong.”

“C’mon, you’re not proposing we go back to the days of internment camps, I hope,” Kelly shot back. “You know better than to suggest that. That’s the kind of stuff that gets people scared, Carl.”

We should be scared, because all signs point to Trump keeping his promise to crack down on immigration—and doing so to a degree America hasn’t seen for over half a century.

Trump’s ethno-nationalist campaign platform had three broadly linked planks: a unilateralist, but less interventionist foreign policy that would put national interest above traditional alliances; a protectionist economic policy that would put the people before the elite; and a restrictionist immigration policy that would, implicitly, reassert white identity as a defining feature of American culture. All three policies are a break not just from the Obama administration, but also the Republican establishment.