Apparently, you need to be reminded that "The judicial Power of the United States, shall be vested in one supreme Court....The Judges...shall hold their Offices during good Behaviour..."
a) when Sesenbrenner says "In the early days of the Republic, the precedent was set that judges are not impeached for unpopular decisions," that's not quite right, unless the "early days" he's referring to are the days the Constitution was signed. Do you see, where it says good behavior, spelled all Britlike?
And what's the opposite of good behavior?
Unpopular decisions? Nooooo, I don't think so.
b) The judicial power of the United States is vested in one SUPREME Court. The Supreme Court, by definition, is the supreme judicial authority in these United States, which means you can't bump it down a notch and make its decisions subordinate to ("audited by") an Inspector General, because then the Supreme Court wouldn't be SUPREME anymore, it would in fact be overseen by this Inspector General, who is not mentioned in the Constitution at all.
Rep. John Conyers Jr. (Mich.), the top Democrat on the Judiciary Committee, said his party is "going to resist all of these encroachments because they compromise the whole idea of the separation of powers."