That was the optics of the reason why RM and RR met in the White House for 4 hours the day prior to RR assigning RM at the SC. OPTICS
Technically he could be offered the job, but it would take an act of Congress, just like what happened when Obama kept him on for two more years beyond the lawful term limits.
They created the optics that was likely what was happening, knowing it could be done again through Congress. Makes it a feasible excuse of why they would meet, although we know it wasn't the real reason POTUS had him in the WH.