The US Constitual protection for privacy only applies to US citizens. Would US citizens be willing to amend it to make it apply to everyone.
That is part of the reason we have a detention facility at Guantanemo.
> No state shall make or enforce any law which shall abridge the privileges or immunities of citizens of the United States; nor shall any state deprive any person of life, liberty, or property, without due process of law; nor deny to any person within its jurisdiction the equal protection of the laws.
Note how it mentions citizens, any person, and persons within the jurisdiction as three separate things... ?
I'm not saying it is wrong to restrict it, just that the constitution should have been so amended for it to be considered a constitutional question.