For years, Justice Thomas’s critics have argued he should recuse himself more often from cases to which his wife has connections. Also that Congress should impose strict ethics rules on Supreme Court justices. This is harder than it sounds. Unlike in lower courts, no one can sit in for justices who have recused themselves. Also, many outstanding potential justices have professionally active spouses; they should not feel as though they must ask their partners to quit in order to serve.

Unfortunately, Ms. Thomas has abused the good faith others have offered her husband, pushing the limits of the ethical gray areas these considerations create. Justice Thomas must recuse himself whenever his wife has a financial stake in a case. The New Yorker’s Jane Mayer reported that Ms. Thomas took more than $200,000 from right-wing activist Frank Gaffney’s Center for Security Policy as Mr. Gaffney asked the court to uphold Mr. Trump’s Muslim ban, which Justice Thomas voted to do. Justice Thomas must also recuse himself from cases that could substantially affect his wife in other ways. That includes litigation regarding the Jan. 6 committee, which is examining Ms. Thomas’s communications.