Departing U.S. Trade Representative Ron Kirk said Thursday that his deputy, Demetrios Marantis, will assume the role of acting U.S. trade representative. Kirk departs his position Friday after four years of service in President Obama’s cabinet. Marantis Marantis, confirmed by the U.S. Senate as deputy U.S. trade representative in May 2009, has been responsible for U.S. trade negotiations and enforcement in Asia and Africa, including the Trans-Pacific Partners...