Relevant to immigration bans, this clause is what seems to give the president very broad authority on immigration (see also Muslim ban).

> Whenever the President finds that the entry of any aliens or of any class of aliens into the United States would be detrimental to the interests of the United States, he may by proclamation, and for such period as he shall deem necessary, suspend the entry of all aliens or any class of aliens as immigrants or nonimmigrants, or impose on the entry of aliens any restrictions he may deem to be appropriate.

Congress shouldn’t be writing this sort of broad language into its laws. Congress has delegated a ton of power to the executive and now Trump is going to pressure test it. The current Supreme Court will decide this clause is wide enough to drive an iceberg through.

https://www.law.cornell.edu/uscode/text/8/1182?utm_source=ch...