Stephen Miller, a top White House adviser, said the administration is looking for ways to expand its legal power to deport migrants who are in the country illegally.

A writ of habeas corpus requires authorities to produce in court an individual they are holding and justify their confinement. Article I of the Constitution says the "privilege of the writ of habeas corpus shall not be suspended, unless when in cases of rebellion or invasion the public safety may require it."

The "privilege of the writ of habeas corpus can be suspended at a time of invasion. So I would say that’s an action we’re actively looking at," Miller told reporters outside the White House.