As 2018 draws to an end, Mohammed is a figure stained with blood. His alleged role in the assassination of journalist Jamal Khashoggi has made him into the bete noire of this year’s Group of 20 summit in Buenos Aires, where the prince landed on Wednesday after a trip to Tunisia. His stop in the North African nation — one of the Arab world’s few functioning democracies — featured crowds of protesters denouncing him for Khashoggi’s abduction and murder last month.

Things won’t get any less awkward in Argentina. An Argentine prosecutor is looking into whether Mohammed can be charged for war crimes, mostly related to the Saudi-led intervention in Yemen. It’s a move made possible by Argentina’s post-dictatorship constitution, which gives the country jurisdiction over any cases of war crimes or torture it would like to prosecute, no matter where they occurred.

“The case against the prince is being pushed by Human Rights Watch, which said it has documented 90 ‘apparently unlawful coalition airstrikes’ in Yemen that ‘hit homes, markets, hospitals, schools and mosques,’” explained my colleague Amanda Erickson.