Supreme Court nominee John Roberts advised then-high court nominee Sandra Day O’Connor in 1981 to stand firm in her insistence not to talk about specific Court cases like Roe v. Wade, saying it could bring up impropriety and possibly disqualification issues later.

In documents released by the National Archives Thursday, Roberts — then special assistant to Attorney General William French Smith and assigned to help O’Connor through her confirmation process — wrote O’Connor to rebut a university professor’s memo.