WASHINGTON — One of the Islamic State terror group’s most senior leaders is reportedly dead, killed in what Iraq is describing as a U.S.-supported operation. Iraqi Prime Minister Mohammed Shia al-Sudani posted on social media Friday that the country’s intelligence service “successfully eliminated” IS deputy caliph Abdallah Makki Muslih al-Rufay’i. Sudani did not say when or how al-Rufay’i was killed, calling the death a “significant security achievement.” Iraqi special forces, in a subsequent post on the X social media platform, said al-Rufay’i was killed Thursday in an airstrike targeting his location in Iraq’s Anbar desert. Officials said the strike was