JUSTICE SOTOMAYOR, concurring in part. 

I agree with the Court that the local litigation requirement at issue in this case is a procedural precondition to arbitration (which the arbitrators are to interpret), not acondition on Argentina’s consent to arbitrate (which a court would review de novo). Ante, at 8, 14. Importantly, in reaching this conclusion, the Court acknowledges that “the treaty before us does not state that the local litiga-tion requirement is a ‘condition of consent’ to arbitration.” Ante, at 12. The Court thus wisely “leave[s] for another day the question of interpreting treaties that refer to‘conditions of consent’ explicitly.” Ibid. I join the Court’sopinion on the understanding that it does not, in fact, de- cide this issue.