If they really do not want you there they will not let you enter the plane in the first place.

I had my "interview" before I even left EU because it was suspicious to them that I am traveling cross-atlantic with only hand-luggage.

When I arrived it was pretty OK, they asked where I will be staying and other general stupid questions you'd expect. All in all it was decent and nothing out of ordinary, definitely didn't ask me to unlock my phone/computer.

I will never forget the last sentences with the border agency.

> Patrol: So how much are you making?

> Me: I'm making this and that EUR a month.

> Patrol: So you must have decent amount of money.

> Me: Yes.

> Patrol: Welcome to United States. stamps my passport