Donald Trump has made alarming threats regarding military action against Iran, specifically targeting civilian infrastructure such as desalination plants and electrical facilities. This raises serious concerns under international humanitarian law, particularly the rule of proportionality, which prohibits attacks that cause disproportionate civilian harm. Despite the U.S. Supreme Court's ruling granting him potential immunity for official acts, avenues for prosecution exist. The International Criminal Court (ICC) currently lacks jurisdiction over Iran, but Tehran could join and grant retroactive jurisdiction. Alternatively, governments could invoke universal jurisdiction to prosecute war crimes, although a 2002 International Court of Justice ruling complicates this for sitting leaders. Establishing a special international tribunal, similar to those for past conflicts, could provide a pathway for accountability. This option requires collective action from nations willing to confront Trump's actions, highlighting the importance of international cooperation in upholding humanitarian law.