You know what, Biden should go on TV and say "if the Court is going to be reviewing so many administrative regulations, it's going to need to be a whole lot larger. Going to need *puts finger in the air* idk, 5 or 6 justices"
Nominee confirmations for the extra benches would cease in the senate.
POTUS would try to do recess administrative appointments & might get a bunch seated.
If Repugnakins control the senate whoever is the majority leader would never recess.