You said:
The FBI never successfully investigated a sitting Congresscritter before, that is news to me.
The FBI did managed to keep the cash and not all documents were returned. What is your point, that Jefferson’s homework could be taken. Do you actually think that is what oversight is all about? Demand to know what is in the desk/safe etc...No, it’s is a constant, efficient, and beneficial check in making sure laws/funding are being followed. You make it sound like a break in operation to go through someones private stash.
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Yet you seem to miss that in the case of Jefferson the Court ruled that the Executive could not just have access to the Congressional records or office (for the purpose of oversight) due to the Constitution and to the separation of powers between the branches. The cash was found in his home. His Congressional office search was ruled un-Constitutional.
Yet you had claimed earlier that the Executive had full power of oversight in regards to the Congress (did you not?) I guess you are wrong.