I've seen that argument too, but it is false. There are no clauses in the constitution and particularly the bill of rights that limit rights to only US citizen

I've seen that argument too, but it is false. There are no clauses in the constitution and particularly the bill of rights that limit rights to only US citizens on US soil. (other than restricting that the presidency be held by a citizen.) The constitution is a document that granted very limited power to the federal government and very broad rights to the citizens. All of what we have now-- from the TSA to the the NSA to DOE is unconstitutional.