John Roberts warns against Texas nullification: ‘Our constitutional system is at stake’ - Raw Story - Celebrating 17 Years of Independent Journalism

"Indeed, '[i]f the legislatures of the several states may, at will, annul the judgments of the courts of the United States, and destroy the rights acquired under those judgments, the constitution itself becomes a solemn mockery,'" he continued, citing United States v. Peterson from 1809 that determined state legislatures can't overrule federal courts.

https://www.rawstory.com/john-roberts-abortion/