IIRC, there is no official requirement that a Supreme Court justice have a law degree. But in practical terms, there is no way anyone would pass Senate review without one.
Sorry to say that the senate or house are public office and would most are lawyers to be regarded as non qualified constitutionally to hold that office. Abraham Lincoln Amendment (11?) original "No Lawyer will be allowed to hold any public office" This whole argument is unqualified because the person (s) who are wanting more aren't supposed to be there to begin with, why in over 100 years hasn't this been the slightest issue. Thus, all problems begin with defiance of our constitutional rights given to the citizens of the United States, to ensure the integrity of the checks and balances