Well, it would be a violation of the coequal branches design of the US government, not to mention a violation of judicial independence, so I'm thinking it wasn't something to be taken seriously.
There are two different types of federal judges in the US government, the Supreme Court, established by the Constitution directly, as an independent branch and those serving on "inferior Courts as the Congress may from time to time ordain and establish."
Arguably Congress has command over those inferior courts since it's up to Congress to establish them, but it'd be a breach of judicial independence and a violation of coequal branches for Congress to be able to order around the Supreme Court.
@volkris
Nope. All federal judges are bound by a code of ethics established by congress. SCOTUS is the only exception.