Aaron D. Miller, Richard Sokolsky

Miller, a vice president at the Woodrow Wilson International Center for Scholars and a former State Department adviser and Middle East negotiator, is the author of The End of Greatness: Why America Can’t Have (and Doesn’t Want) Another Great President; he tweets here. Sokolsky, a non-resident senior fellow at the Carnegie Endowment for International Peace, was a member of the Secretary of State’s Office of Policy Planning from 2005–'15.