I think for some of the spying they needed to get a warrant from a judge but since it was a secret it was like a sort of secret Court. Those warrants were basically always rubber stamps and the judge said yes something like 99% of the time. I think he's saying that like from now on they will only do it 95% of the time. Maybe.

At least that's my understanding. Too lazy to look it up so I'll wait for somebody to correct me