Update: According to Steven Watt, El-Masri's lawyer, the Obama administration probably couldn't make the "state secrets" claim in the Inter-American Commission, which does "not recognize blanket prohibition on accessing courts to assert fundamental rights." However, " Obama can try to argue that the state secrets privilege was legitimately raised before domestic courts and El Masri thus wasn't denied access to a remedy (one of El Masri's claims before the IACHR) but in our view, based on our assessment of international law, Obama wouldn't prevail."
He adds: "there is no equivalent of the state secrets privilege recognized under international human rights law to bar a human rights victim accessing an international tribunal such as the Commission."