[tptacek]

Virtually no discussions I've seen on the Internet about executive orders seem to involve people who really understand executive orders. Executive orders do not in fact give the President the power to override Congress. All they do is define the manner in which the administration will execute the authority granted to it by Congress and the Constitution.

So it is indeed true that Obama altered immigration policy through executive order by changing enforcement priority to avoid deporting children, and it is indeed true that Trump will change that back. But in neither case is a President making new law by doing so: US immigration law doesn't require the administration to have or not have those priorities.