Elbridge Colby, then the Robert M. Gates senior fellow at the Center for a New American Security, asks U.S. Air Force Gen. Paul J. Selva, vice chairman of the Joint Chiefs of Staff, a question during a National Defense University Center conference in Washington, Jan. 19, 2016. (DoD photo by Army Staff Sgt. Sean K. Harp) WASHINGTON — Less than a day after President Donald Trump paused military aid to Ukraine, his pick for the top Pentagon policy job frustrated Democrats by refusing to state

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