The NYT has Inside the Supreme Court Ethics Debate: Who Judges the Justices? -- In private meetings and memos, the justices made new rules for themselves — then split on whether they could, or should, be enforced.
To piece together the previously undisclosed debate, The Times interviewed people from inside and outside the court, including liberals and conservatives, who spoke on the condition of anonymity to discuss the proceedings and the justices’ thinking. This article also draws upon public statements by the justices, who declined to comment.
ABA Journal has One justice was 'especially vocal' in opposition to enforcement mechanism for SCOTUS ethics code, report says
Justice Neil Gorsuch feared that an enforcement mechanism could undermine the Supreme Court and “was especially vocal” in his opposition to it, the article reports. He wrote a memo “raising questions and cautions” that was more than 10 pages in length, the article says. Two other justices—Justice Clarence Thomas and Justice Samuel Alito—“wrote off the court’s critics as politically motivated and unappeasable” in private exchanges, the article says.
And see this Slate article here.