Why shouldn't non-citizens be protected by The Constitution? Not a lawyer, but these came up pretty quick in a Google search.
"It is well established that, if an alien is a lawful permanent resident of the United States and remains physically present there, he is a person within the protection of the Fifth Amendment. He may not be deprived of his life, liberty or property without due process of law."
Kwong Hai Chew v. Colding
". . . The Bill of Rights is a futile authority for the alien seeking admission for the first time to these shores. But, once an alien lawfully enters and resides in this country, he becomes invested with the rights guaranteed by the Constitution to all people within our borders. Such rights include those protected by the First and the Fifth Amendments and by the due process clause of the Fourteenth Amendment. None of these provisions acknowledges any distinction between citizens and resident aliens. They extend their inalienable privileges to all 'persons,' and guard against any encroachment on those rights by federal or state authority."
Bridges v. Wixon
"The alien, to whom the United States has been traditionally hospitable, has been accorded a generous and ascending scale of rights as he increases his identity with our society. Mere lawful presence in the country creates an implied assurance of safe conduct and gives him certain rights; they become more extensive and secure when he makes preliminary declaration of intention to become a citizen, and they expand to those of full citizenship upon naturalization. During his probationary residence, this Court has steadily enlarged his right against Executive deportation except upon full and fair hearing. . . . And, at least since 1886, we have extended to the person and property of resident aliens important constitutional guaranties -- such as the due process of law of the Fourteenth Amendment."
The difference is that non-citizens don't have a right to enter the US, so while they can't be compelled to share their personal information, they can "voluntarily" choose whether to share it and enter the US, or go back.
> non-citizens don't have a right to enter the US...
Here's where I take issue, by obtaining a visa to enter the US for work/ travel you go through security checks and you were deemed safe/ not a terrorist.
So what changed from when you were issued a visa to when you landed in the states?
For me, this feels like China all over again. If requesting passwords becomes prevalent in the US, then the same precautions that travelers take when entering China will become the norm from the US.
Why shouldn't non-citizens be protected by The Constitution? Not a lawyer, but these came up pretty quick in a Google search.
"It is well established that, if an alien is a lawful permanent resident of the United States and remains physically present there, he is a person within the protection of the Fifth Amendment. He may not be deprived of his life, liberty or property without due process of law."
Kwong Hai Chew v. Colding
". . . The Bill of Rights is a futile authority for the alien seeking admission for the first time to these shores. But, once an alien lawfully enters and resides in this country, he becomes invested with the rights guaranteed by the Constitution to all people within our borders. Such rights include those protected by the First and the Fifth Amendments and by the due process clause of the Fourteenth Amendment. None of these provisions acknowledges any distinction between citizens and resident aliens. They extend their inalienable privileges to all 'persons,' and guard against any encroachment on those rights by federal or state authority."
Bridges v. Wixon
"The alien, to whom the United States has been traditionally hospitable, has been accorded a generous and ascending scale of rights as he increases his identity with our society. Mere lawful presence in the country creates an implied assurance of safe conduct and gives him certain rights; they become more extensive and secure when he makes preliminary declaration of intention to become a citizen, and they expand to those of full citizenship upon naturalization. During his probationary residence, this Court has steadily enlarged his right against Executive deportation except upon full and fair hearing. . . . And, at least since 1886, we have extended to the person and property of resident aliens important constitutional guaranties -- such as the due process of law of the Fourteenth Amendment."
Johnson v. Eisentrager