Either Roberts (compromised due to his sketchy adoption of Irish kids) or Sotomayor (corrupt somehow).  POTUS made a comment approx a year ago about RBG & Sotomayor not staying on court due to Ginsburg's health (obvious) and Sotomayor's diabetes.  Figuring the "diabetes" (which she has managed since childhood) was just the cover he used to tell us she is dirty.