Actress Allison Janney, who played former press secretary C.J. Gregg on the show the West Wing, and currently staring in the CBS sitcom Mom, makes a surprise appearance during the Josh Earnest's daily Presidential briefing, in the Press Briefing of the White House on April 29, 2016. Allison Janney is here to highlight prevention against drug uses and abuse. <br /> Credit: Aude Guerrucci / Pool via CNP/MediaPunch
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