I did a little research. Federal employees are covered under Title 5 of the US Code.
There is sn office of Special Counsel to handle appeals from federal employees over alleged unfair employment practices.
This office has a staff of 120 ( not to be confused with Mueller’s office.)
This smells like Sessions was trying to show he has the balls to do it to Trump.
If a direct link can be shown to Trump for the firing it possibly adds to the impeachment case.
I wonder if the firing is a violation of the Hatch Act?
I haven’t seen a clear statement of the grounds for termination. If he is denied his pension benefit he has another action to appeal for legal purposes I believe, denial of benefits.
We will pay for any malfeasance in office by the office holders ultimately.
This will turn into a circus and add to the cluster f. Also makes we wonder if it’s a smoke screen to cover something else? Now I sound like a Reddit poster.