Earlier quoted context omitted.
The FBI is responsible for monitoring lawmakers too, it is possible for Congresspeople and their staff to break laws. It's part of the FBI official list of duties. I specifically and explicitly want law enforcement monitoring elected officials. Imagine if all you had to do was claim you were researching legislation and law enforcement just disengages, that is a ludicrous request.
> When she told them about the proposed legislation, they insisted on knowing what it would say, whether it would be formally introduced, and when. Is that really necessary?
I would imagine that those questions would be easily answerable if true, similar to how a border guard might ask seemingly random questions in that context but a series of 'uh, uh' answers might indicate something else. Sometimes investigators ask questions just to keep the target talking and build a report. Those questions are reasonable to expect a public figure politician and their staff to answer.