As the chairman of the Joint Chiefs of Staff Gen. Joseph Dunford descended into Baghdad on Monday, the highest-profile passenger aboard his military aircraft was neither a seasoned Iraq hand nor even someone who’d visited the country before. It was Jared Kushner, the 36-year-old commercial real estate magnate, whose marriage to President Donald Trump’s eldest daughter has thrust the otherwise inexperienced diplomat into the center of US foreign relations and seemingly every top issue facing the administration. Kushner was visiting Iraq at Dunford’s invitation to receive briefings on the military campaign against ISIS, and planned to meet with US and Iraqi officials.