Sheldon Whitehouse actually said...

"What is the difference between what is required to prove that somebody is an agent of a foreign power?"

"But he doesn't really have to be one?"

"And yet that remains a nominal requirement for the Lone Wolf authority, doesn't it?"

"Rather than continue to exist in a sort of fairyland in which a burden shifts to an empty chair and we all pretend to be satisfied with that set of procedures, we should maybe try to rethink how to do..."