Jeff Sessions actually said...

I think it creates quite a bit of pressure to give Miranda warnings on many, many, many cases if the presumption is those cases are going to...

It just almost is not done unless it has to be done for some very significant reason.

The President said of course we are not going to give Miranda to people we arrest who are combatants against the United States.

Throughout the history of modern nations, they all have intelligence agencies and have to operate with some degree of secrecy.