The construction that Washington, D.C., is bringing to the 4th Amendment is that any “reasonable” search is o.k., but unreasonable ones require a warrant. Furthermore, that a warrant is required to search and seize particular persons and conversations, etc., while massive searches of everybody of everything they say or write or transact, is o.k.
Clearly, the warrant is the method by which the reasonableness of the search is to be guaranteed. That is, the executive needs to go to a judge for the warrant. And, that warrant has to specify the particular person or thing to be searched and seized. No blanket searches and seizures.
Bump!