You do not need a constitutional amendment. Until 1911; part of a Supreme Court Justice’s job was “riding circuit”, to serve on more local circuit courts. This practice was established and abolished by Congress. Congress has the existing constitutional authority to assign Justices to circuit courts.
There is also a recently proposed TERM act, which would promote Justices to senior Justices after 18 years. A senior Justice is still a Justice, but would not actively decide cases unless there was a shortage of active Justices.
Congress could also impeach some of the current Justices. Either for partisan political reasons; perjury at their confirmation; or blatant corruption.
You do not need a constitutional amendment. Until 1911; part of a Supreme Court Justice’s job was “riding circuit”, to serve on more local circuit courts. This practice was established and abolished by Congress. Congress has the existing constitutional authority to assign Justices to circuit courts.
There is also a recently proposed TERM act, which would promote Justices to senior Justices after 18 years. A senior Justice is still a Justice, but would not actively decide cases unless there was a shortage of active Justices.
Congress could also impeach some of the current Justices. Either for partisan political reasons; perjury at their confirmation; or blatant corruption.