Welcome to Supreme Court Brief and week two of the October argument session. The justices have a high-stakes argument this morning featuring former U.S. solicitors general in a face-off over Puerto Rico and the Constitution’s appointments clause. We look at the arguments and the lawyers. Plus: The old, discredited Insular Cases popped up in last week’s arguments over non-unanimous juries. We spoke with a lawyer who thinks the justices’ comments suggest they might reconsider the Insular Cases in the Puerto Rico challenge. Thanks for reading, and feedback is always welcome and appreciated. Contact us at [email protected] and [email protected], and follow us on Twitter at @Tonymauro and @MarciaCoyle.