Barr’s major point was that Apple won’t unlock the perp’s encrypted phone and that the Feds want this authority.
Why doesn’t he dial up his buddies at the NSA, who vacuum up every electromagnetic emmission? Heck he could probably use the NSA to pursue other investigations, even some investigations concerning the FBI itself.
They have it and it is meta data.
They will not admit to it.
It will show the routing of data, and that ain’t happening.