U.S. Defense Secretary Jim Mattis said Monday the United States does not intend to seize Iraqi oil, shifting away from an idea proposed by President Donald Trump that has rattled Iraq’s leaders. Mattis’ arrived on an unannounced visit in Iraq as the battle to oust Islamic State of Iraq and Syria militants from western Mosul moved into its second day, and as the Pentagon considers ways to accelerate the campaign against the terror group in both countries where it still holds significant territory.