Biden names former Hillary Clinton aide as national security adviser

Sullivan was close with former Secretary of State Clinton, working on the former first lady's 2008 presidential campaign as a top adviser. At the State Department, he replaced Anne-Marie Slaughter as the Director of Policy Planning after she returned to Princeton University.

Sullivan also worked as an adviser to Sen. Amy Klobuchar (D-Minn.) and is a graduate of Yale and Oxford.

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