Because he’s a federal employee and they have all kinds of rules that protect them. Break the rules like everyone would have Sessions do and kick him to the curb and he’d hire the best DC lawyer and walk away scot free.
They’re doing it by the book so there are no mistakes, no loopholes, and when they get these guys they are going to stay got.
And a FBI agent w/o a security clearance is useless to his employer. It is the inside way to get them terminated without having to prove cause. Good job.
And he might have to be kept on the payroll to compel testimony, though he could still claim the 5th.
Like Lois Lerner?