President Donald Trump insisted Sunday that Iranian cultural sites were fair game for the U.S. military, dismissing concerns within his own administration that doing so could constitute a war crime under international law. He also warned Iraq that he would levy punishing sanctions if it expelled American troops in retaliation for a U.S. airstrike in Baghdad that killed a top Iranian official. Trump’s comments came amid escalating tensions in the Middle East following the killing of Gen. Qassem Soleimani, the head of Iran’s elite Quds force. Iran has vowed to retaliate and Iraq’s parliament responded by voting Sunday to oust...