MSNBC's Katy Tur hosts "The Beat" on Friday, February 2, and reports on the U.S. launching strikes against Iran-backed militias in response to the killings of 3 American soldiers. Kelly O'Donnell, Keir Simmons, James Stavridis, Matt Bradley, Dan De Luce, Andrea Mitchell, Hooman Majd, Dennis Ross, Elise Labott, Barry McCaffrey, John Garamendi, Courtney Kube, Jen Psaki, David Rothkopf and Marc Ginsberg join to discuss.
