State immunity — Jurisdictional immunity — Head of State immunity — Foreign official immunity — Claims for immunity under common law — United States State Department Statement of Interest — Whether position of United States State Department determinative — Whether entitlement to foreign official immunity for jus cogens violations

Relationship of international law and municipal law — Customary international law — Common law of foreign sovereign immunity — Foreign Sovereign Immunities Act 1976 — Whether entitlement to foreign official immunity for jus cogens violations — Whether immunity under Torture Victim Protection Act 1991 — The law of the United States of America