Unfortunately, the intrusive nature of the procedure is completely legal, particularly as it applies to foreign visitors, and is not likely to be overturned in court in spite of the Fourth Amendment’s constitutional guarantee that individuals should “…be secure in their persons, houses, papers, and effects, against unreasonable searches and seizures.” Someone at a port of entry is not legally inside the United States until he or she has been officially admitted. And if that someone is a foreigner, he or she has no right by virtue of citizenship even to enter the country until entry has been permitted by an authorized US Customs and Border Protection official. And that official can demand to see anything that might contribute to the decision whether or not to let the person enter.
Foreigners have no legal right to enter the United States and can be denied permission (a visa) to do so. It's kind of like building a wall, one might say.
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