A warrant isn't an effective safe guard unless you trust the government to only prosecute actual crimes. The US federal government has demonstrated, explicitly,

A warrant isn't an effective safe guard unless you trust the government to only prosecute actual crimes. The US federal government has demonstrated, explicitly, that it is willing to use law enforcement for political ends and will charge private citizens for political reasons (like the reflecting pool case). Now is not the time to be giving more power to the executive or its policing functions.