The Contitution and Bill of Rights does not mention any protections for illegal aliens.
Because of that, law enforcement and courts do not have to protect the 1st, 2nd, 3rd, 4th, 5th, 6th, 7th or even 8th Amendment rights of illegal aliens.
The Fourth Amendment provides protection for "the People," so you may have an argument there.
The First Amendment says that Congress shall make no law prohibiting the free exercise of religion, without specifying who is protected. Is it your view that Congress could pass a law saying that every alien in the United States must convert to Mormonism or be executed without trial?
The Eighth Amendment says that no cruel or unusual punishments shall be imposed, but doesn't say on whom. Is it your view that Congress could pass a law saying that every illegal alien in the United States shall have their genitalia cut off and then be boiled in hot fat?