Jamie Raskin has just written an opinion piece in the New York Times describing two means of forcing recusal. 

1. The U.S. Department of Justice can petition the other seven justices to require Justices Alito and Thomas to recuse themselves not as a matter of grace but as a matter of law.
2. The Constitution, and the federal laws under it, is the “supreme law of the land,” and the recusal statute explicitly treats Supreme Court justices like other judges: “Any justice, judge or magistrate judge of the United States shall disqualify himself in any proceeding in which his impartiality might reasonably be questioned.” This recusal statute, if triggered, is not a friendly suggestion. It is Congress’s command, binding on the justices, just as the due process clause is. Indeed, there is even a compelling argument based on case law that Chief Justice Roberts and the other, unaffected justices should raise the matter of recusal on their own (or sua sponte). 

https://www.nytimes.com/2024/05/29/opinion/alito-thomas-recuse-trump-jan-6.html?unlocked_article_code=1.vk0.FYfL.lFK0L-zXESac&smid=url-share