Iraq’s caretaker Prime Minister Adel Abdul-Mahdi indicated he would leave a decision whether to expel U.S. forces from the country to his successor, potentially slowing a push that could trigger American military-aid cuts and sanctions. The targeted killing of Iranian Maj. Gen. Qassem Soleimani and a top Iraqi paramilitary commander by the U.S. this month brought the status of U.S. troops in Iraq to the top of the country’s political agenda. It led Parliament, which is dominated by Shiite factions, some aligned with…