Sen. Mark Kelly, D-Ariz., appeared on MS NOW's "The Rachel Maddow Show" on Monday, where he responded to the Pentagon's announcement that it has opened a formal review into allegations of misconduct over a video calling on service members to "refuse illegal orders." On Monday, the Pentagon announced its investigation into Kelly, a retired Navy captain, and said it may call the senator back to active duty to face court-martial proceedings or other administrative actions under the Uniform Code of Military Justice (UCMJ). When asked by Maddow about the Pentagon's investigation, Kelly said, "Well, Rachel, I said something that was...