No one is above the law.
Sadly, the evidence appears to suggest otherwise. Until the Democrats and Republicans in Congress get together and pass laws to enforce ethics rules on the SCOTUS, as they have with all other federal courts, then the members of SCOTUS are indeed above the law.
I wonder if Congress can withhold SCOTUS operational funding until something is done?
They could do a hell of a lot more than that. The Constitution defines the SCOTUS and states:
Congress has the power to modify the powers of the Supreme court. They could, if they had the will, take away the vast majority of the power of SCOTUS. Congress could add exceptions to the SCOTUS’ appellate powers for all matters except matters “affecting ambassadors, other public ministers and consuls, and those in which a state shall be party.” With the President’s assistance, Congress could even expand the court and alter the current majority.
They could do all this, but they won’t, and for the same reason they won’t impeach the blatantly ethically bereft members of the court. Because the Republicans are benefiting from the status quo and they will never allow the Democrats to change it as long as they have more than 40 seats in the Senate and a majority in the House.