The United States is not about to plunder Iraq’s petroleum reserves, U.S. Defense Secretary Jim Mattis, who arrived in Baghdad on Feb. 20, said as he sought to soothe partners rattled by U.S. President Donald Trump. Trump has repeatedly said both while campaigning and since his election that America, whose troops occupied Iraq for eight years, should have grabbed Iraqi oil to help fund its war effort and to deprive the Islamic State of Iraq and the Levant of a vital revenue source.