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Ahead on the 4/18 Maddow show

Tonight's guests:Don Borelli, a 25-year veteran of the FBI where he once served as assistant special agent in charge of the New York Joint Terrorism Task Force.

Tonight's guests:

  • Don Borelli, a 25-year veteran of the FBI where he once served as assistant special agent in charge of the New York Joint Terrorism Task Force. Currently chief operating officer of the Soufan Group, a strategic consultancy. 
  • Michael Leiter, former director of the National Counterterrorism Center, NBC News national security analyst and currently a counselor at Palantir Technologies
  • Pia Carusone, the executive director of former Congresswoman Gabrielle Giffords' political action committee "Americans for Responsible Solutions." She was Congresswoman Giffords' chief of staff when she served in Congress.  

And here's executive producer Bill Wolff with tonight's preview: