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To put it another way, BECAUSE the government falls into three branches, the 1st Branch, Congress, cannot interfere with the coequal 3rd Branch, SCOTUS. That would blur the branches.
That includes trying to enforce this sort of power over members of the other branch.
But in the technicalities, if you're interested, I'm referring to "such inferior Courts as the Congress may from time to time ordain and establish."
The law you quote is arguably part of Congress's establishment of inferior courts, as establishment involves their rules of operation.
