Re: Let's be clear. Senators and Con-gresspeople are ignoring the written Constitution.
Your point on "unreasonable" is why warrants need to be cleared by the court system, as opposed to the FBI, or others, making up the rules as they go along. Within the court system, despite all of its failings, using case law as precedence does establish the boundary for reasonable vs unreasonable. Given that Article III of the Constitution established the Judicial Branch, in the full context of the Constitution, it is clear.