Iranian protesters gather during a demonstration organized by diaspora groups calling for political change in Iran and responding to appeals by opposition figures, outside the Iranian Interests Section in Washington, DC, on March 17, 2026, US President Donald Trump said that he does not know whether Iran's new supreme leader Mojtaba Khamenei is still alive, adding that Washington was unclear whom it could negotiate with in Tehran. (Photo by Amid FARAHI / AFP via Getty Images)