McCarthy: Is Mueller's Grand Jury Step One To Impeachment?

Are there any boundaries to Robert Mueller's investigation? Deputy AG Rosenstein says yes. Should we trust Rosenstein's reassurances that Mueller must follow Justice Department regulations? Should we read anything into the fact that Mueller impaneled a grand jury? Is Mueller’s grand jury step one in the impeachment of President Trump? Is there any shred of evidence to support the narrative that Trump committed a crime? Former Chief Assistant U.S. Attorney Andrew McCarthy joined Dan and Amy to discuss.