Patterson Belknap submitted an amicus brief that played a significant role in Justice Sonia Sotomayor's June 29, 2026 dissent in Trump v. Slaughter. The brief was filed on behalf of legal historians Noah A. Rosenblum and Nathaniel Donahue, arguing that the concepts "quasi-legislative" and "quasi-judicial" as used in Humphrey's Executor had long histories in American law and provide workable definitions to guide the Court's review of congressional limitations. 

In the dissent, Justice Sotomayor, joined by Justices Elena Kagan and Ketanji Brown-Jackson, cited the brief extensively. Justice Sotomayor relied on the brief to explain that the concepts were well-established well before the Humphrey's decision, and were used by many political figures and by courts developing a “quasi-judicial” category for officers whose duties resembled a judge’s.

To read the amicus brief, please click here.