'Mad Dog' Mattis: What You Need to Know About Trump's Defense Pick Listen Download Embed Share Share this on Facebook (Opens in a new window) Share this on Twitter (Opens in a new window) Share this via Email Marine Gen. James Mattis, commander, U.S. Central Command, testifies on Capitol Hill in Washington, Tuesday, March 5, 2013. ( Evan Vucci / Associated Press ) Hosted by Todd Zwillich Produced by PRI and WNYC