It is absolute (sorry if the answer is wrong)
The Code of Hammurabi (APEX)
They realized that nothing really changed much. The freed African-Americans still had almost no political rights and the system was controlled mostly by corrupt politicians who came from the north to become rich. The regular people still had huge farms and turned the former slave system into a system of sharecropping which was in many ways similar to slavery. The freedom was very superficial and in reality people still lived as bad as before the war.
This could be an issue in light of the fact that the delegates wouldn't have the capacity to "control" the President if the president could fire judges from the Supreme Court on the off chance that he didn't care for a decision they made.
A Supreme Court Justice might be arraigned by the House of Representatives and expelled from office if indicted in a Senate trial, however just for similar sorts of offenses that would trigger prosecution procedures for some other government official under Articles I and II of the Constitution.