It's so simple. How do you destroy the entire medical complex? You put them all in one big truck and set a cinder block on the gas pedal right before you jump out.
POTUS can't be there in the lab to verify every single vial and make sure all the scientists are telling him the truth. If his top scientists lied to him about the efficacy and safety of the vaccines that's not in his purview to put a labcoat on and do his own analysis.
But he can get it to market as fast as humanly possible and rip the veil off the entire fucking temple