That's the stupidest thing I've ever heard.
A person's ideology is totally separate from their qualifications.
Bullsh!t.
A person whose ideology is based on a political/economic system whose implementation requires the complete eradication of the underlying principles of the U.S. Constitution is utterly unqualified to be a U.S. Supreme Court justice. If you don't accept that, then you'd do well to figure out how you intend to live and do business under a governing document that has been subverted by emanations, penumbras, international law, etc.