Erbil, Iraq  — President Trump has threatened to cut off all U.S. support for Iraq if the country reelects former Prime Minister Nouri al-Maliki for a third term.  Al-Maliki, a member of Iraq's Shiite Muslim majority, was forced to resign in 2014 after two consecutive terms in office amid pressure from both inside and outside the country as it grappled with the rise of the Sunni terror group ISIS . Here's what to know about al-Maliki, why Mr. Trump is refusing to work with him, and what the