In a system that is supposed to be built on checks and balances, what are the checks on the FBI? We have a problem.
The FBI answers to the DOJ. The DOJ answers to the president. The president answers to the people and can answer to Congress in the case of impeachment. And of course Congress also answers to the people.
It's the Deep State that wants the FBI and the DOJ untethered from the president and answering to nobody but the Deep State.