Frequent analysts and contributors to the show include CNN's Chief National Correspondent John King, Chief Political Correspondent Dana Bash, Senior Political Analyst David Gergen, Senior Washington Correspondent Joe Johns, David Mattingly, Investigative Reporters Randi Kaye and Gary Tuchman, Special Investigations reporter Drew Griffin, and Legal Analyst Jeff Toobin. Other contributors include Josh Campbell, truTV's legal analyst Lisa Bloom, terrorism expert Peter Bergen, Senior International Correspondent Nic Robertson, and addiction medicine specialist Dr. Drew Pinsky. King, "The Situation Room" host Wolf Blitzer, Chief Medical Correspondent Sanjay Gupta, Chief Washington Correspondent Jake Tapper and "New Day" co-anchor John Berman frequently serve as the fill-in presenters when Cooper is not available.