Do you have evidence to the contrary?
Fourth Amendment for who?
Yes, we have proof that they have eroded the Fourth Amendment. Warrantless wiretaps have already been used [a violation of that Amendment]. That has been testified in both court and Congress.
Fourth Amendment for who? Well, if you read the words "The right of the people to be secure in their persons, houses, papers, and effects, against unreasonable searches and seizures, shall not be violated, and no Warrants shall issue, but upon probable cause, supported by Oath or affirmation, and particularly describing the place to be searched, and the persons or things to be seized" you will see it says "the people", not "citizens" as it does in other sections of the Constitution. That would indicate that it covers anyone in the country. Period.
This little "the people" vs "citizens" is why we have Gitmo and retention instead of bringing supposed bad guys to the US. When they are here, citizen or not, they have rights.
That would be the WHO.